They literally think they are doing the work of some divine creator. They have plenty of time to ruin the lives of other people because they think it saves their own.
And many of these people really do need their Good Works on the force to do the saving, because God knows what they do to their wives and kids back home.
They also believe in eternal torture as punishment. If someone doesn't accept their god, their god will send that person's soul to hell to be tortured forever. Therefore, essentially anything can be justified to force people to accept their god, since no finite amount of harm can exceed the infinite torture of hell.
People who believe that sort of thing are, IMO, extremely evil, and worshiping an evil deity.
And many of these people really do need their Good Works on the force to do the saving, because God knows what they do to their wives and kids back home.