Mike had to earn his stripes and protect his family. Do you actually think mike would let Werner escape and go on the run himself and leave his daughter in law and granddaughter behind? Let’s not forget what happened to the kid that killed combo. Mike was no angel himself, he’s killed in the past and it only gets easier after every time.
Remember how shook Mike was when he thought someone might be following his daughter-in-law? He knows full well that every moment he works for Gus, he's putting her at risk. She's at risk from Gus's men if he slips up and she's at risk from Gus's rivals if he does his job. Just look at how Jesse's girl got offed by Todd. He can't sit around and act as her bodyguard, he's got work to do and she's vulnerable as fukk. Whereas if he ghosts, what does anyone get out of killing his family? They're perfectly safe with him not around, a lot safer than they are with him around, and he can wire them money from wherever he lives.
So far as we know the ONLY guys he's killed in the past were his son's murderers, and they were about to off him too when he did it. Killing a murderer who you hate with the deepest passion you will ever have and killing a friendly German engineer who like personally like aren't even in the same universe. If killing got so easy, then why is it that in the whole BB era he never kills anyone other than thug gunmen who already have blood on their hands? How come he never kills Walter when Walter does way more to deserve it than Werner ever did?
So far as we know the ONLY guys he's killed in the past were his son's murderers, and they were about to off him too when he did it. Killing a murderer who you hate with the deepest passion you will ever have and killing a friendly German engineer who like personally like aren't even in the same universe. If killing got so easy, then why is it that in the whole BB era he never kills anyone other than thug gunmen who already have blood on their hands? How come he never kills Walter when Walter does way more to deserve it than Werner ever did?