The comment has so little substance that it's not promoting any meaningful discussion. I don't think the problem is your opinion or that you are outraged, it's how you chose to express it.

Add details like who should go to prison, why, where did they cross the line, are they actually violating a law or do we need a new law, is it a problem with the system or with the individuals. All of these would be interesting things to discuss and would make your comment more meaningful. Right now I'm not even sure who you would like to see in prison.