"I would never-"
You would if you were tired enough. You would if you were hungry enough. You would if your mind and body had been worn down enough, through pain or disease or toil or violent struggle. You might if you were put on the wrong medicine, or you got the wrong kind of head injury, or you were forced to choose between someone else and yourself. You might if your livelihood was staked on it, or all your hopes and dreams. You might if you didn't know what else to do, if it's what you were taught or if nobody taught you anything else.
I have not been worn down in most of these ways. I have lived a remarkably privileged life. But I have been worn down in some ways. And they were enough to teach me that in the wrong circumstances, any of us can become someone we don't want to be. It's worth keeping that in mind.