I would like it more if the MoL-British-invasion was being set up to actually question this system of extrajudicial killing-or-pardoning-depending-on-how-they-feel-that-day and presenting alternatives that were at least semi-viable - because the system the Winchesters and allies have going is fucked from so many ethical perspectives. But alas, I'm pretty sure the BMoL is here to validate it because, hey, at least our boys are not quite as bad as Mr. Ketch.

I think you may right. I think Mr. Ketch and the BMoL might only be here to be the "at least we're not as bad as them " option. I guess we've dropped the "let's try to save all the people" theme from S11, though, if we actually have to stop and think about whether to kill the psychic teenager.