2 things. My OP was about how Trump's rhetoric scares Europeans and corrodes Trump's power abroad, not about if he's right or not. Secondly having said that, I fail to see how any wall will be able to stop people from coming over, especially a 2000 mile border. People cross the mediterranean in what amounts to rafts if they get desperate enough. People crossed the Berlin Wall and that shit was barb wired, mined and guarded by people with orders to kill anybody who tried. Especially considering the fact that Trump wants to revisit NAFTA thereby almost assuredly impoverishing Mexico and create the same desperation that makes people want to come over to begin with.
You have internalized the views of the Conventional Wisdom, created by your media and political class.
Part of that it that your in laws are stupid and/or racist, for supporting TRump.
If they are wrong about that, they could be wrong about the rest of it.
Are you prepared to consider that?