Because Europe's wars cost us dearly in the 20th century.
Economically, it's blatantly obvious. But it's not a perspective that's in anyone's interest to push.
I have no doubt that if the eagle-boner's wildest wet dreams came true and the US had to intervene on Europe's behalf, there'd be a big fat bill at the end.
The critical thing is all that debt and industrial capacity, presented with the prostrate markets of the world.
Personally, I don't see any reason to station US troops in other countries, but I'm outnumbered.
When the music stopped in August, 1945, guess who was most widely deployed, had the people and wherewithal to lead? Guess whose closest partner - the UK - was wholesale getting out of the Empire business? Disregard the industrial Golem we had.
We have entire cable channels dedicated at least partly to rerunning propaganda designed for consumption by Americans for WWII to his day.
The image of protector of Europe is probably an illusion maintained to ensure that the US can put its forward radars and anti-missile batteries in strategically superior locations.
https://en.wikipedia.org/wiki/Anti-ballistic_missile
Regardless, I'm not sure why a US base is required in Europe for the sole reason of housing a defensive ABM.
It also makes it easier to estimate the target area for each vehicle, and assign priorities accordingly.
The US and best buddy Israel have developed some incredible anti-missile and anti-artillery technologies [0][1]. While really expensive, they do ensure that a very clear and obvious act of war has to occur in order to seriously damage a defended area. A handful of guys with plausible deniability can no longer just fire some rockets and mortars over the border and expect to get away, to do it again later. The projectiles that might have killed someone are destroyed in midair, and return fire is already incoming to the original firing positions.
It is possible that the US has fielded systems on its own that are at least an order of magnitude more expensive than those shared with Israel and Europe, but are not known to have been tested by live fire, because of the increased difficulty and expense in firing missiles that can hit US territory. Iron Dome protects cities and towns. Whatever the US has probably protects whole states, if not the entire continent. The military certainly isn't spending all 3% of the whole US economy on individual soldier benefits. And not everything produces as much disappointment as the F-35. Sometimes the big expensive thing actually works as intended.
Telemetry stations in Europe are not necessary, but they are cheaper to operate than the alternatives. And they provide the PR benefit of, "Oh yeah, I guess we can provide first-strike deterrence for your country a little bit too, while we're at it."
You need only look at the recent history of the Crimean peninsula to know that your country has to have some strategic importance to the US in order for the American military (or diplomatic corps) to even attempt to defend it. The more recent additions to NATO would be wise to see to their own defenses, under the presumption that NATO is far more able to avenge than protect.
[0] https://en.wikipedia.org/wiki/Iron_Dome [1] https://en.wikipedia.org/wiki/Arrow_3
That is not how the world works at this time. "Citizens" are here to provide work for the state. Voting is illusory and until the masses wake up (not holding my breath), it will remain the case.
Just old and bitter?
Citizens are allowed to vote. For the sake of this argument, lets leave out the actual process of voting. Citizens elect official.
Citizens are NOT consulted for major decisions post election of said official. Citizens can bluff and buster all they want. Elected official can do as they please.
Lobby groups have more access to decision making process than citizens, and way more pull as they control the purse strings to re-election and keeping elected official with a job.
Therefore, I posit that it is simply naive to think "citizens" could demand the US to retreat from Europe anymore than they could demand an invasion of Europe. The world simply doesn't work that way. I am not saying it can't... it is going to take a whole lot more than electing Bernie Sanders or Donald Trump or Hillary or some horrible clown to get the power into the hands of the Citizens.
The bigger question(s) are; has power EVER been truly in the hands of the masses/citizens? Why do people cling on to that as a good way forward? Leadership by committee in my experience has been horrible beyond reproach...
So, yes, citizens could stand to wake up, I agree.
That's not true - majority of countries don't come close to speding 3.3% of their GDP on military (world's average is ~2.3%?). For example highest EU spenders are Poland with 2.2%, France with 2.1% and UK with 1.9%. Everyone else spends significantly less than 1.5%. And that's just looking at the % and ignoring the fact that USA has largest GDP in the world.
US is nowhere near "in line with other countries." Unless you count "other countries" only the handful of Middle East countries like Oman, Israel, Jordan and Iraq.
(Source: http://data.worldbank.org/indicator/MS.MIL.XPND.GD.ZS?year_h... )