Anyone that took the case was in it for the clout to some extent. It's a huge case that the entire country was going to follow and would affect their careers for the rest of their lives.
And as far as the negative attention, Kyle came out squeaky clean with all the not-guilties and video evidence showing exactly what occurred. This isn't like Zimmerman where there's question of why a guy ran after a black kid for a minute before going to stand by his truck. Kyle was proven beyond a doubt to have been assaulted first and then trying to run away, it's next to impossible for him to not be able to get on with his life especially when he's still young enough to have a baby face going on so in a few years he'll look drastically different and not even be recognized.