Yep. Snatch is simple torso extension and squatting motion. Some 50 years ago everyone did these ballistic movements, now everyone bench.
I would rate running as one of the most complex movements (with lots of potential for injury) a human can do but I have never heard anyone say don't run unless you can get a coach to look after you.
Just Torso extensions and squatting? Well then just go ahead and try a SIMPLE overhead squat and tell me how simple that is, then just try and imagine the force needed to lift, in this case, 300 pounds off the ground, keep the bar in a straight line and stop it on top of your head before you fall back. (and there's a lot more involved)
Btw, have you ever tried snatching or even overhead squatting? Most people i know have difficulties just squatting or front squatting in correct form let alone snatching