It's odd to me you picked deadlift to call out as dangerous.
The deadlift is certainly dangerous, but only in the sense that almost any large lift is dangerous for the untrained. But in my experience, the deadlift is a very natural motion for me and most people who I've seen get into lifting heavy. Fixing people's natural instincts is usually just pointing out a few cues--if you look up deadlift workshops most are are only an hour long. And if you are lifting too much weight, you just drop it.
The squat is a much more complicated motion: squat workshops are usaully full-day events, and the ways it breaks down tends to change as you add weight, so just getting the form is a long-term process. It's also a more dangerous lift if you have too much weight because you're under the bar.
