cops can be worse than criminals- study of empirics

so this happened.... after grocery shopping, i come out to my car and start to load the vehicle and someone behind me says something. when i turn around and notice they have a *fucking gun* pointed at me. the guy looks at me and says "you ain't him, you old," turns around and leaves....someone in an adjacent parking lot is shot and taken to the hospital, and the police want me to talk to them about what i saw. I'm not feelin a cop and my helping seems dangerous, so i tell them i'd like to not be involved, i didn't see what happened at the shooting, there was no way to prove the person who held me at gunpoint, etc, assuming this would be sufficient...The officer then tells me that i'm "the witness to a crime" and that if they need to they can "get a material witness warrant" and can hold me until i offer the information they need...so, despite me telling them i didn't know what the man looked like, and that i was pre-occupied with the Sig P226S he had in his hand and having my life flash before my eyes, i needed to offer this man some information. Criminality flipped in front of me: officers strong-arming information from me and being more intimidating than the "criminal" who actually made my life flash before my eyes with his loaded 9MM. i'm not tryin to be collateral damage. it made it seem like the police cared more about possibly catching this person, and if that meant putting my life at risk to do so, then well that's just what it takes. i felt more in danger in my prolonged conversation with police, in which i was accused of "bangin" of "aiding and abetting" and that "if I didn't want to help, the DA would assume i was hiding him and end up being charged"- scare tactics that would probably have broken me at other times of my life. I described the gun, pointed out the height of the guy and what kind of kicks he was wearing, and told them if they were planning on holding me for information i didn't have, that I needed to call the ACLU, the NAACP and my local attorney before we went any further, which i'm sure is why i'm at home now and not still still sitting in the front of a police car (you think you're gettin me in the back of one of these? fuckouttahere) or sitting in a jail cell, for my own protection. Interesting that at the end of the day, my interaction with the officers as they did what was self described as SOP ended up causing me more anxiety and stress than having a weapon pulled on me and only upon his reflection that i was too old to be who he was looking for, was I not shot and from where he was, killed.