Alright. Most places would investigate crimes and charge you for them before they look at your defense itself, so I had several worries about that
One of which is self indications (even of things that cops didn't know about or couldn't prove) that would allow them to just question anyone into admitting even a parking offense, but I guess you can shut up indeed
I was worried that they could use any crime in a broad area and just force everyone to say with who they were and what they were doing, but you can also shut up
I was also worried than on investigations with no real crime involved, they could just go play jeopardy and ask you what you were doing minute by minute, and get you to talk until something gets inaccurate (while they have cctv but you have no vcr in your brain). But again, you can shut up.
When I'll be in America, I'll remember not to talk to cops.
Not even to 911 as emergency calls are error prone : You said someone was attacked by a suv and knife when it was a pickup truck and machete, you go to jail
> I was worried that they could use any crime in a broad area and just force everyone to say with who they were and what they were doing
In authoritarian countries, that absolutely happens. In America and the West, police are generally expected to have reasonable suspicion of anyone they detain to interrogate, and the length of detention is also limited if no evidence validating suspicion is forthcoming. They could not simply arrest everyone in the proximity of a crime, and geofence warrants are controversial exactly because that was the standard in the analog world.
> I was also worried than on investigations with no real crime involved, they could just go play jeopardy and ask you what you were doing minute by minute, and get you to talk until something gets inaccurate
Again, they must have reasonable suspicion to even detain you. You are reasoning about law codes as if they were literalist computer code for a compiler. The law, at least common law in America, is written by and for humans who are expected to exercise good faith as a part of enforcing and interpreting the law.
Do know your right to remain silent, and ask for a translator and consular assistance if detained or arrested. Police departments will provide these things because attorneys in court will question the reliability and admissibility of any testimony in the absence of their provision.
Don't worry too much about police if you're in America to visit. They're ordinary people who mostly want to catch criminals who are hurting their community. Bad apples are rare, and bad apples who harass someone on a tourist visa are rarer still.
> Not even to 911 as emergency calls are error prone : You said someone was attacked by a suv and knife when it was a pickup truck and machete, you go to jail
Very few states have anything resembling this specific federal statute, and one doesn't typically call 911 to obtain service from federal law enforcement agencies. And in the case of a 911 call specifically, "heat of the moment" and "good faith" do a lot of work.
Unless you obviously intended to mislead an emergency services response, you will not be criminally implicated from good faith statements made during a 911 call regarding some incident you merely observed as a bystander.