He'd never walk if he did deadlifts and squats in the same day. Besides squats are overrated. We over-train them in America and we undertrain the deadlift. Deadlifts has more practical applications in life, like helping a friend move, and in sports, like kicking and jumping and tackling. Gray Cook recommends training your deadlift 3 times to every time you train your squat. There is a lot going on with deadlifts in terms of shoulder stability and posture so it's not all just strong hamstrings. mahalo
~Chach~

Which is why I personally like squats but that is part of their downfall as well. Because it works the entire body so extensively, I know from personal experience and talking to other trainees that your entire body begins to fatigue, sometimes faster than your legs. I have walked away from the squat rack completely gassed and had no issue walking the next day because I didn't destroy my legs. Like the squat, deadlifts work the entire body as well but to a less degree. There is a difference between stabilizing your core to protect your back in a squat versus a deadlift because of gravity and weight placement (obviously). I've also read elsewhere that you should train both front and back squats as well as going into rock bottom squats to get the full compliment of benefits. The problem with these are 1) now you are doing two exercises instead of one and 2)most people can't get into a naked rock bottom squat, let alone a weight loaded one. I have pushed over 450 pounds on one of those leg press sled machines but I don't know if I have ever squatted over 200 pounds with free weights and I'll tell you next week how much I can rock bottom squat but my guess is that it is under 100. Those are pretty steep downgrades. So do squats. Part of the reason I am psyched about going back to a real gym is that I can do real squats again. I have achieved some real results doing squats with my kettlebells, I am not saying that they are useless. But if you have to pick one exercise because you are pressed for time then doing the deadlift is a better option. If it's good enough to kill Jón Páll Sigmarsson then that's something I want to be doing regularly at the gym. mahalo
~Chach~

It's because I don't go back and re-read my posts so my ideas come out pretty convoluted. This article does a better job of concisely explaining my point and references the Gray Cook article I spoke of (adobe is being a pain and I can't see the original).

http://www.malepatternfitness.com/2009/1/19/727688/squatting-dead-to-me

Squatting is great but the deadlift is the exercise you want to train more. mahalo
~Chach~