I'm not making a normative claim about what your best strategy is to protect yourself from a police investigation, but rather a positive claim about ordinary people's attitudes towards the police, which are not (gesturing towards this thread) this.

Most people simply don't see themselves as being in zero-sum contests with the police. If you are in such a contest, those videos you've watched are quite useful and important. But when there's a hit and run on your block, expect your neighbors to go out of their way to volunteer information to the police.

I've read threads here where people have made impassioned arguments that you yourself should never volunteer information to the police investigating a crime such as a hit and run. The police will turn it against you and somehow make you the target of their investigation! Ordinary people out in the world do not think that way, and you will not succeed in making them think that way by showing them videos of lawyers explaining why the only thing you should ever say is "I do not consent to any searches and will not answer any of your questions".

If you said that to a police officer doing a canvass in my neighborhood, people would look at you like a space alien.

I think it's helpful to understand all this stuff when reading things about Flock. People on HN and in activist communities seem gobsmacked that all the Flock cameras haven't been taken down yet (in fact: ALPR deployments are growing, not shrinking). But they have wildly different priors about policing than the median resident of a muni with ALPR cameras.