yes your right. But with killing his 'dad' they kill the don. And with killing the don they lose much of their political power.
But your right, Mikey didn't care of losing the don but he care of his father.
But i thought killing McCluskey was the point. That was bussines. It wasn't because he smacked Mikey in the face, at least that's what i think.

Killing Sollozzo was personal.
But to do that he needed to kill McCluskey. He killed McCluskey cause he need to, not cause he smacked Mikey in the face. So McCluskey was (half) bussines

'This was just another Bronx tale.'