A couple of pesos:
IME, all else being equal, the more realistic your training is, the greater the chance of suffering significant injury. Can we prevent all accidents/injuries, no. Can we reduce accidents/injuries, yes.
Do you have valid concerns, absolutely.
Without having been there and seeing/knowing everything you're talking about, however, IMO no way to say if you were out of line or not. If you were yelling at someone in front of others (which is slightly different than saying a very heated discussion broke out) you May have become too emotional in expressing your opinions.
The lead instructor of the class sets the tone. He/she should be trying to ensure that students have a controlled learning environment. If people are running amok and doing things unsupervised or unchecked and the instructor knows about it, then that's an instructor or school issue/problem. Sometimes the instructor(s) are aware of those types of problems and sometimes they aren't.
IMO, people should try to resolve the situation at the lowest level first - i.e. talking to your training partners about your expectations and, in a constructive way, their areas which need attention or improvement. If that doesn't solve the issue(s), then you can choose not to work out with that person and/or make the instructor(s) aware of the problem and potential risks. If that doesn't solve the issue(s) and there are more problem training partners than good, it may be time to switch classes or even schools.
Btw, I have suffered quite a few injuries over the years too - from as minor I'll be all right as soon as the room stops spinning, this stops bleeding, I'm able to walk this off, or the boys drop down again to as serious as requiring surgery, being unable to work, and being light duty for an extended period of time. I do share your pain and echo your sentiments.
Last edited by Don; 04-15-2012 at 03:20 PM.