It is protecting yourself if you were gonna get killed if that person was alive .Mike was gonna kill Lydia and her daughter
Because she tried to kill him. And him killing her daughter was never gonna happen, it's why he gave her a pass in the first place, because he didn't want to kill a mother with her kid in the next room. That's why he said "this is what I get for being sexist".
Walt has poisoned a kid and detonated a bomb in a retirement home. What has Mike done comparable to that? Nothing....he's never endangered innocent people like Walt....nor has he ever lied and manipulated like Walt does Jesse....matter of fact, he paid Walt a visit just to warn him "hey man, you're being too reckless" with that half-measure monologue.
I don't really understand comparing the two. Walt is currently well on his way to being a villain, Mike is an anti-hero.
Fred.