Most of them are internal conflicts though.

It's not such a crazy idea really, but I'd rather we just abolished NATO entirely.

I'm no fan of Russia, but I don't want to go to war just because they shoot down a Turkish fighter plane in Syria, etc.

That’s not how NATO works. It’s a defense pact not a suicide pact. In any military action outside their territory, other countries are not obligated to help. Admittedly casus belli are often a bit of a stretch, but so far NATO has never joined an aggressive war. Various countries chose to join the American Crusade in Iraq but the war in Afghanistan was certainly started in defense.

NATO has ensured 70 years of peace in Western Europe. There hasn’t been a period this peaceful since the Pax Romana, which still had plenty of wars. Why mess up a good thing? Less people die in wars now. And while the value in trade and infrastructure compared to land is certainly a part of ensuring the peace, that was also true for the decades preceding the Great War. The modern international order is simply more peaceful.