"Terrorism" is of two kinds: terrorism that is evil based upon wicked tyrannical acts, and terrorism that is good and desired based on necessary and justified acts. The terrorism that is evil is injustice, double standards, tyranny, and aggression, in all the hateful connotations that these words imply. It targets women and children, civilians and noncombatants, trying to force defeat and difficult political decisions by spreading terror. This kind is what most people immediately think about when hearing the word terrorism.
The terrorism that is desired and based on necessary and justified acts is enforcing the rule of just laws, providing fair punishments commensurate to the crimes committed, and preparing and defending against attacks, aggression, and corruption. It is used against the criminal evildoers themselves, and never targets women, children and noncombatants.