Still i think that the US has the unique situation of having relatively well armed civilians
This is a double-edged sword. In other countries the government is really reluctant to have the military shoot protesters, because the protesters are civilians and, pretty much by definition, unarmed. If the police or military do shoot protesters, the undecided public is very likely to turn against the government for slaughtering innocent, unarmed civilians.
In the US, police are terrified of civilians, and are more than willing to shoot them. Civilians are fairly likely to be armed, so if the government claims that the civilians shot first, a lot of people will believe them.
Hahaha, no. The idea that devices with microphones are always spying on you is absurd. It just doesn't happen. It couldn't happen due to how much power and bandwidth it would require. And if they were it would be the corporations spying, and not the government. As for emails and text messages, sure. The US may collect a lot of data, but they can't process a lot of data. Look how many violent attacks there have been in the US, and how few have been prevented
They're really bad at spotting anything before it happens. When attacks fail, it's almost always because the attacker screwed up, not because the spies found out ahead of time. The Nazi who tried to drive a U-Haul into the White House wasn't stopped by spies, he was stopped by a security barrier, even though he'd been planning the attack for 6 months.
But, there's always a small chance that they'll stumble on you if you're plotting something.