It really depends. I've put someone through a disciplinary before for a really expensive failed change. Not because they made the mistake but because they failed to do any sanity checks before hand or post-imp checks - they just bashed it in and walked away.

I'd never go this route with a geniune mistake as they are life's best lessons. But there is a difference between an honest mistake and a mistake that could have been easily avoided had process been followed.

People who talk bgp should be above mundane & cruel human dynamics and culture because their function is too important. All bgp speaking people i know are and perhaps thats both why this discussion is held and why the internet is still up and running. "If you don't know what you are doing, don't do it"