The tweet is to cover his ass. First Cuban talked about the slippery slope" and he said this:
"I know that I'm not perfect. I know that I live in a glass house and it's not appropriate for me to throw stones. And so when I run into bigotry in organizations I control, I try to find solutions. I'll work with people. I'll send them to training, I'll send them to sensitivity training. I'll try to give them a chance to improve themselves. Because I think improving, helping people improve their lives, helping people engage with people they may fear they may not understand and helping people realize that while we all have our prejudices and bigotries, we have to learn that it's an issue that we have to control -- that it's part of my responsibility as an entrepreneur to try to solve it, not just to kick the problem down the road. Because it does my company no good, it does my customers no good, it does society no good if my response to somebody in their racism or bigotry is to say, 'It's not right for you to be here, go take your attitude somewhere else."
In his "apology" to Trayvon's Martin's family, he reiterated his belief that the content of what he said was true.
Cuban understands he has to vote to get rid of Sterling or lose countless millions in the value of the Mavs. But this is the second time he has stated the same concept. His position is very clear.