Classic car owner gets arrested (falsely) for stealing his own car

My brother in law is in law enforcement and a few years ago he spotted a stolen '69 Camaro that was valued at like $100k or somethin' crazy like that. Pulled the guy over, got him out of the car, and the dude tried to run. My BIL tackled him and cuffed him. Turns out that the guy was wanted for murder.

I get that cops have to be careful because you never know who is going to be in the car, and what they're capable of doing, but this just seems excessive. The guy was trying his best to cooperate and was treated very poorly. They should have double checked the VIN and tags before tossing the dude in the slammer. What a bunch of incompetent idiots.