IANAL, but I'd be surprised if the police was allowed to raid me, launch tear gas through my window and shoot me in the head. Even with a warrant. I'm not worried about this happening, because it doesn't. If it did, I'm sure it would blow up into a huge scandal.

I am worried about government agencies intercepting my traffic / communications because it does happen, it's really hard to find out unless you know what you're looking for, and they don't have a warrant on every American citizen that happens to get caught.