If you think that's really the reason the advocates of it want one, you're an even bigger dope than most of us think you are already. There are two primary reasons the Democrats ever bring up a draft, the first being to destabilize any Republican President (How much enthusiasm have Congressional Democrats had for conscription since Obama took office, versus under Bush?), and to a lesser degree, to enable more of their shiftless constituents to get a piece of the veterans' entitlements pie without having to take the dreaded personal responsibility for enlisting.
There are one or two, like Rangel, who in a different age were drafted and served, and actually do believe in the principle you describe (In addition to the low-life motives above, of course), however they are living in the past. The current maximum authorized size of the Army is smaller than in-theater troop strength at the peak of the Viet Nam War, and a mere shadow of the size it was when Rangel served, with far more restrictions on handling problem soldiers than in his day, including of course Congressmen like himself looking over every leader's shoulder and a press with no understanding of the military always hungry for a chance to play the iconoclast. For the size of force that Congress wants to authorize, and what they expect it to be able to do within those means, a draft would render the Army an undeployable babysitting and career-retraining service, useless in any military sense.
















