Eh? I'm reading a whole lot of bullshit in these 2 paragraphs. The squat should be a natural movement, its just been conditioned out by western society. Look at any child when they drop something on the floor, down they go in a natural squat to get it, not a bloody lunge.
And as far as injury risk, weighted lunges can be very risky for the knees if not done properly and with less stability than squats they could easily be considered more dangerous in a way.
Overall I see squats as having far more benefit purely from the amount of muscle recruitment they require to perform... this is why they are a main lift and not an assistance lift like lunges.