Devote some time to learning the skills of collegial/co-worker/work place ethics. The skills include: practicing the requisite style of language, using the golden rule and doing least harm, learning to handle conflict, and mentoring others. A reasonable learning approach is to study the principles of collegial ethics, to discuss cases and relevant principles in groups, to practice the skills required, and to discuss again the outcome of your actions.

Be aware that our inborn tendencies and automatic responses to colleagues and situations are part of human nature, but they are not always rational and useful to us. There are many questionable ways that we can convince ourselves to do nothing and avoid helping. Studying these tendencies and responses and their effects is a first step in freeing ourselves from them and in developing new options for ourselves.

Having a personal belief, solely and simply by itself, cannot justify harmful actions to others. The actions and their consequences must be judged by themselves and independent of underlying beliefs.
 

Simple dislike of a person can never justify destructive actions toward that person.