Why do you need a driver's license to buy alcohol, when you can't drink & drive?

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My teenage daughter thought of this one *_* Of course, the most logical answer would be for identification purposes. But still, don't you at least think it's just a bit ironic? Like, what if you got pulled over for drinking and driving and the officer asks, why are you drinking and driving? The most logical answer would be, I used my driver's license to buy it and now I'm using to drive also. Naturally, the officer would say that's illegal and ask you to step out of the car. You reply-"But if I can use my license to drive and buy alcohol, why can't I use it to drink and drive? That would be very funny, don't you think?