America has committed genocide, it has tolerated and supported slavery, it has enacted policies in support of eugenics. All legal, all duly enacted by elected representation in Congress and the presidency. But in each of those cases it was thoroughly right and proper for American citizens to criticize the wrongful acts of the government and to call, vociferously, for a change of policy.
The same is true today. And it is in keeping with the foundational constitutional freedoms of this republic (the right to free speech, to petition the government for the redress of grievances, the right to assembly) to do so now.
To boot, the remainder of your critique is also off base. The electoral college is broken. And redistricting, gerrymandering, and voter suppression are incredibly "unfair". These aren't petty quibbles, these are truths. Federal courts have established that voter suppression has been happening, that illegal gerrymandering has been happening. Fantasising that these assaults at the integrity of our elections and representation are somehow inconsequential is either ignorance bordering on disastrous negligence in the stewardship of American democracy or simply villainy. Which describes your position?
in 2016: democrats won 53% of the vote, republicans 43%
in 2014: democrats won 43% of the vote, republicans 52%
in 2012: democrats won 53% of the vote, republicans 43%
Part of the problem when comparing popular votes nationally is that you often have situations in CA where the two candidates running for office in the general election are both democrats. when the sum total of those votes is 10m, or the differential between the number of votes the republicans received nationally and the number democrats received nationally, is it fair to complain about a lack of representation? Other times within house races there wont even be a challenger.
Saying "it's not democratic!" isn't a useful comment.
We know.
One downside to strictly proportional representation is that a concentrated majority can make decisions without collaborating/cooperating with the minority.
Example: Coastal states with large populations could just ignore the other states with small populations.
The US bicameral congress balances the proportional House against the non-proportional Senate.