If it makes you happy, do it. If it makes other people miserable yet increases your morale, do it. Analyze a situation and choose the action which best benefits yourself. When frustrated, kick animals that can't hurt you. Our hair was not designed to be pulled out by its roots, but too often it is.
Nothing is wrong with aggression to relieve tension when used appropriately.
The flavor of our own pain after hitting a door allows us to realize that we have struck out at whatever has plagued us, albeit inadvertently. The soft thud of a pillow, however, leaves us unsatisfied. Rest assured that it's mutual. Assume that everyone around you is either for you or against you. Those that are for you will mindlessly follow your opinions and decisions, and as such, can be ignored.