Sorry, I am deeply skeptical that the first event happened. The police in the US do not have the right to stop individuals without reasonable suspicion of a crime.
I was 18 and in community college. I couldn't drive so relied on rides to and from. Sometimes I had several hours between classes so initially I went for long walks since there wasn't much else to do. There was a quiet neighborhood across the street so I usually walked around there.
That stopped after a cop drove up to me and ordered me to state my business. "What are you doing here?" he asked.
"I'm just walking around," I said. "I-"
"_Why_?" he asked, looking incredulous, like I had just said I had been trying to skateboard on the back of a turtle.
Apparently he had been called because of my "suspicious activity": there were some cool rocks on the shoulder of the road that I had stopped and fussed over. (And probably pocketed, because hey, cool rocks)
There's your reasonable suspicion: college kid picking up interesting stones from the public shoulder of a road.
If Mr. Policeman says you look suspicious, guess who's getting stopped?
I'm not saying the cop can't ask you questions, I'm saying he can't demand your ID and run it for warrants, and you're free to leave that situation if you want.
That feels OK to point out.
"You can beat the rap, but you can't beat the ride."