she still resisted arrest
Right, but you see, I don't consider "she resisted the arrest that probably shouldn't have happened to begin with" to be a compelling point.
she didn't even get to realize if she was dealing with dirty cops
But that's the point I'm making, dealing with a law system you know nothing about is an unknown risk. You can't just tease out what they're going to do with you, you have to make a decision. The reason we say to cooperate with police isn't because it's not logical to flee a situation you're afraid of, it's to make the jobs of the cops & the courts easier.
she just escaped as soon as she was declared to be under arrestland she dipped
This isn't entirely correct. From the episode transcript on this site, she runs away once Naga attacks one of the cops, which came after increased aggression from their end. As in, right before that, she was almost hit by a cable swung hard enough to crack stone. She actually hadn't attacked the cops before that. That's the kind of thing I mean by "inappropriate escalation."
not to mention she destroyed the area when fighting the triads surely she was thought of personal belongings or did she knew and she just destroyed all the shit for fun
Fights are hectic & you become focused on doing what you need to in order to stop the threat, so people are generally given the benefit of the doubt in self-defense. Apparently, the RCPD doesn't think so, & that's one of the reasons I think their priorities are bass-ackwards.
because I am sure she could have handled the triads without breaking most of the work places she's the avatar after all
Again, they can warn her that they'll take future action if she isn't more careful. You put all this emphasis on what Korra could've done differently, but the cops have a lot of power too, not to mention way more experience, so I don't see why they should just get a pass. Just because they're cops doesn't mean they're automatically right, if anything they should be held to a higher standard.
another thing the avatar is never supposed to be a hero or choose sides
This goes against the entirety of the first series. Nothing prohibits the Avatar from "taking sides" or defending people, they've all done it. What they're not supposed to do is show favoritism, taking a side for selfish reasons.
so it's a justice kind of thing than hero
Heroes are unrelated to justice?