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.
Trigger warning: politics is hard mode.
"How to you make America safer from terrorists" is the title of my op-ed published in Sun Sentinel, a very prominent newspaper in Florida, one of the most swingiest of the swing states in the US for the presidential election, and the one with the most votes. The maximum length of the op-ed was 450 words, and it was significantly edited by the editor, so it doesn't convey the full message I wanted with all the nuances, but such is life. My primary goal with the piece was to convey methods of thinking more rationally about politics, such as to use probabilistic thinking, evaluating the full consequences of our actions, and avoiding attention bias. I used the example of the proposal to police heavily Muslim neighborhoods as a case study. Hope this helps Floridians think more rationally and raises the sanity waterline regarding politics!
EDIT: To be totally clear, I used guesstimates for the numbers I suggested. Following Yvain/Scott Alexander's advice, I prefer to use guesstimates rather than vague statements.