Wow, I didn't realise US police were that bad. After reading this I don't think I could ever feel safe enough to visit the US. Sounds like you'd have a better chance of getting justice in an African dictatorship where at least the dont-rape-me bribe would be affordable. Tourists really should be warned about this, because it's not the image the US tourist boards present to us at all.
Arizona, New Mexico, Texas, Louisiana, Mississippi, Alabama, Georgia, Florida, North and South Carolina, Tennessee, Virginia - fear these places.
I think it's important to remember a fact of humanity: you're generally safer on familiar ground, around people who are similar to yourself. It can be very interesting, exciting, and rewarding to be "the foreigner", but at the same time you should never forget when you're in that position.
Of course one of the horrible things about Texas is it does this sort of thing to actual Texans, in addition to other people. It's really an indictment of the people of the state: could you form a decent jury, judiciary, legislature, or police force if it had to be made up of Texans?