By the time he became boss the castellammarese war had just ended and those who gained the power were interested in peace after the war was over.
Once the commission and peace was established and organization was brought to the streets, taking out a another boss would be pure suicide for those responsible.
I agree. Taking on any boss would have been suicidal. Not to mention a lot of guys were probably content (as long as they were earning money), no need to take on a boss.
