Yes, exactly! :)

I think the most important part of Teyla's decision is she's not just doing it for herself, her son, and her friends. Michael's a galaxy-wide problem, like you said. It boggles that she'd let him go because he's all about the "woe, you have wronged me." Yes, well, if society produces serial killers by its mistakes, should we let them go too because we have wronged them in the past?