Thank you. I've tried explaining this to various people when discussing my on drug use. There's a common presumption that a person's brain, in its default state, is "OK", and that any messing with it is bad. Yet people typically do not have this same view of the (rest of the) body; few people get bent out of shape over diabetics shooting insulin. The brain is a meat machine sitting in a chemical soup and is no more or less inherently perfect than your heart, blood, or pancreas.
The stigma attached to drug use is horrendous and keeps many people from getting proper treatment or even understanding that they may need help.
People whose brains are broken by default end up self-medicating, or living miserable lives, or both, often because people believe that "drugs breaks the way your brain is supposed to function."