I don't think it's a punishment in terms of the kid is out of school - the seriousness of what that conveys should result in parental and future repercussions that are very serious. I don't think it's really about punishment - detention would be a punishment, as you're doing something you don't like. But suspension is beyond the punishment stage - it's making a permanent mark on your school record that you exhibited a serious behavioral issue - it is more about long-term marking of your record, as colleges would see that (if they told us correctly). Parents who care about that would be forced to take it more seriously, also having to deal with their kids outside of school - essentially, the school is saying, "your turn - you need to take over and get through to your kid", as opposed to detention, where the school deals with it. I went to a prestigious college prep school, though (not bragging, just a fact), so the whole reason for why we were there was to shine academically and get into excellent colleges - it involved a lot of money invested by our parents and a lot of time and work invested by us....to have that marred by a suspension, to detract from our long-term goal.....yeah, that would have really sucked. But outside of that environment/motivation for the parents and students, I'm not sure suspension would be of any benefit - other than as a nice break teachers would have from classroom difficulties.