I think you're misunderstanding me, I'm not disagreeing with how unacceptable, reprehensible and un-fucking-ethical police behaviour is: the Police suck and are, in many cases, an unfixable organisation.
I'm disagreeing with the death penalty.
The fact that it's traditional is entirely irrelevant and, at worst, an appeal to tradition.
End the death penalty.
I'm not convinced you're asking yourselves the right question. Do you want revenge and punishment, or do you want a better society?
Don't get me wrong, the USA are so fucked up currently it's hard not to want to get back at those causing so much damage. I share that feeling.
But we know from evidence that prison as punishment just generates more violence and horror and doesn't create a better society. Prison as rehabilitation does a lot better towards that goal.