It's a valid concern. Even a gun range or concealed carry class won't teach you what you need: Situational awareness, proper draw technique, muzzle discipline, etc.
Sheepdog Response - headed up by Tim Kennedy is another good org. with an aim to prevent responsible (safe) self-defense training. [1]
Tim is an (active) green beret and retired UFC fighter, and their org. is geared entirely towards teaching the average citizen how to safely defend themselves (both armed and unarmed). It's the real deal, and their classes are pretty much 2 full weekend days.
1 - https://sheepdogresponse.com/
edit: I do not represent them in any way. Just believe in their mission.