Looking at our southern border and at the wolffish way the democrats look at imported votes, I doubt that we would have handled the problem better. The problem is nihilist multicultural progressivism in both of our societies.
We (UK) can't even get a proper Patriot Act.
Americans don't fcuk about. Trump's ascendency demonstrates that as he'd be hung out to dry by the PC establishment here.
What I don't doubt is that the US is in a better position because of an accident of geography - Mexicans vs Muslims.
The gun argument going on here is specious as well. If everyone had guns then these cnuts would just use more bombs. It would make no difference at all.
The only solution in Europe is a Police State and zero tolerance on any association with extremists.