Comment by hylaride
It's camaraderie. Some of the best professional relationships I've had were in terribly run organizations with like-minded peers. I don't know why, but strong bonds form in those situations (and taken to the extreme in the military).
> It's camaraderie
Ok, but it's not loyalty. At least I hope not...
Those like-minded peers you've had owed you no nothing. You had a fair, respectful, professional relationship with them that was self sustaining and therefore did not demand allegience in either direction.
If a better opportunity came along for them I would hope that you would want them to take it despite your history and the camaraderie you've established with them. And same for you.