As a die-hard SV!Lex-apologist, accustomed to defending supervillains, I can say outright that...Michael is nuts. Going after Atlantis is one thing, but I don't see how killing thousands of people can be excused as "survival." Those people weren't trying to kill him. He didn't *need* to try to create a whole new species, and he didn't need to infect thousands of innocents to exact revenge on the Wraith.
What the Atlantians did to Michael was reprehensible (not the first time so much, the experiment was questionable ethically, but understandable. But the second betrayal, after he'd helped them - yeah, that didn't just cross a line, it trampled over it) and they handled it badly. I do feel for Michael, enduring those transformations against his will, and being left with no people of his own; I don't really blame him for going completely insane. But he was insane, and incredibly dangerous, and I don't think Teyla was wrong to do what she did. I don't know if she was right, either - but I don't think it violated the integrity of her character, or the show.
(Also, regarding the morality of heroes killing villain, you really should watch Avatar. In one ep there's this big conflict over whether a hero should kill a dangerous villain - the hero doesn't want to do it, as he's a Buddhist type who refuses to kill (he's a vegetarian, even). But the show makes a point that this is a *selfish* choice - that the hero is putting his own moral integrity above the good of the world. (Yes, it makes this point explicitly, in a children's show. Have I mentioned how much Avatar rocks?))
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What the Atlantians did to Michael was reprehensible (not the first time so much, the experiment was questionable ethically, but understandable. But the second betrayal, after he'd helped them - yeah, that didn't just cross a line, it trampled over it) and they handled it badly. I do feel for Michael, enduring those transformations against his will, and being left with no people of his own; I don't really blame him for going completely insane. But he was insane, and incredibly dangerous, and I don't think Teyla was wrong to do what she did. I don't know if she was right, either - but I don't think it violated the integrity of her character, or the show.
(Also, regarding the morality of heroes killing villain, you really should watch Avatar. In one ep there's this big conflict over whether a hero should kill a dangerous villain - the hero doesn't want to do it, as he's a Buddhist type who refuses to kill (he's a vegetarian, even). But the show makes a point that this is a *selfish* choice - that the hero is putting his own moral integrity above the good of the world. (Yes, it makes this point explicitly, in a children's show. Have I mentioned how much Avatar rocks?))