They are intrinsically morally questionable if not just plain morally wrong. Imagine someone was destroying your stuff you don't want to be destroyed or trying to end your life prematurely you'd very much like to continue. Ah, you might say, but it's not immoral when done to bad people. But you are the bad people according to someone's definition.
If you don't understand how it's more morally questionable than helping victims of natural disasters you are a way worse person than op who naturally chose to say "I saved people from natural disaster", not "I went to hot countries to kill some brown folk and destroy some of their stuff because my commander said they were bad".