A lot of Americans are American because their European ancestors got sick of European affairs and wanted a clean break from it.
Nonetheless, a lot of the anti-interventionist rhetoric seen on the net today feels very astroturfed. Anybody accusing NATO of warmongering is safe to write off as a Russian-aligned troll, considering Russia is the one who actually invaded a foreign country. NATO's "war mongering" amounts to offering sanctuary to the countries with a rational fear of being invaded by Russia.