i may or may not have said this in the past, but I use to be a Hawks fan growing up because Dominique Wilkins was my favorite player growing up. Once he left Atlanta, I realized that with free agency and the way the NBA was a star driven league, that having a favorite "team" was pointless. So at that point, I just started following players that I liked. Once Chris Webber was drafted and traded to Golden State, I started following whatever team he was on. I always hated Kobe and the Lakers and when Cleveland drafted LeBron, I started following him pretty closely too.
I have no allegiance to teams in the NBA, I simply follow the players I like and root for them. Like I'm rooting for Durant in OKC, and I was rooting for Chris Paul in New Orleans.
now with saying that, i'm also not the type of NBA fan that's running around town wearing 7 different jerseys of different players.
So to answer your question, I guess, no, i'm not simply pulling for Bron and the Heat because he left Cleveland. I liked Cleveland when he was on them, and I don't have a problem with them now. I don't have a problem with any ohio teams really, other than osu. I don't blanket every team in ohio with hate like a lot of osu fans do with teams from Michigan. But that's probably because i'm from here. Are all the ohio teams my favorite teams? no, they are not, but I still follow them closely enough.