I don't know if I'm misconstruing what you're saying, but it sounds like LEO's could approach any one and simply arrest them for no reason and it is still a lawful arrest until you are able to prove them wrong later?
I appreciate that you have open discussion when it comes a professional officers point of view on these things. I am in no way anti cop as someone said earlier. I have great respect for those LEO's that are professional, ethical and moral. It just frustrates me to see the bad seeds like this one who in my opinion make your job increasingly dangerous by alienating those they serve.
I've actually signed up to participate in one of those citizen academies with the PD where I live to gain a better understanding of what LEO's jobs are like.