This one may end hotter than the last. US troops in Poland will feed the already fervent Russian nationalism. Do not underestimate the national psychological need to feel “on top.” Americans don’t really know what it feels like to be a member of a nation that used to be strong, but is now considered second tier.
Rational debate will not stem this tide. There are two options: Stand unquestionably strong, drawing a line which the US has every intent to defend. Or do nothing at all. Half-measures will merely stir the coals.