And I suppose other countries that treat terrorists more harshly never experienced suicide bombings?

But just saying that would not be getting to the meat of your point. The question to ask is not whether what they did led to Paris and Brussels, but whether if doing something different would have prevented Paris and Brussels, or led to Berlin, Milan, and other prominent cities being bombed.

As always, I'm ready to update my beliefs, and if you can show that me sufficient proof that a heavy police presence would be more optimal than not for the sake of decreasing the resources flowing to ISIS and its ability to do suicide bombings, I'll be happy to update.