Self-restraint is a characteristic of which pillar of character?

Responsibility

Explanation:

Character is an encompassing term which incorporates an individual's actions and behavior, be it from a a cultural, social or religious notion or perspective. In general, an individual's character is grouped into 6 pillars which include, Trustworthiness, Respect, Responsibility, Fairness, Caring and Citizenship. Self restraint falls under the responsibility group which puts the onus of an individual's actions and it's accompanying consequences on his shoulder. With this burden of action and behavior, it is imperative that individual's be restrictive in action and indulge only in such actions which are essential and he can bear its burden.

when comparing the cases, what similarities are there in the cases that suggest one person committed these murders?