I'm not pulling out a gun anywhere populated unless the choice is that or I end up dead. In which case prison is an upgrade. I would consider european jail a great chance to read up on the classics while I enjoy not being dead.

Even where I live now (constitutional carry state, extremely lax on guns) pulling from the holster without a threat is gonna get you tossed in prison. Nobody knows you have it until you do that.

Why not go the legal route and get a gun permit? Seems to be a much better option if you believe that you need a gun for self defence.

Totally, if that's an option that would be a rational choice. For instance, if I ended up in Poland I would buy a black powder revolver and carry that (legal) and if I ended up in Czech Republic or Austria I think the permit is very easy. The pure hypothetical is ending up someplace where it isn't practical to get the permit.

In practice I just live in a place that does not even require a permit.