Well since somebody asked.
It's not so much lazy as something drastically unknown and something diagnosed at too early an age. Kids under 10 are bound to be hyperactive and unable to concentrate 9 times out of 10. I was diagnosed young, one of the first accurate ones, to be frank. Everyone wanted an excuse, everyone wanted a way to make things easier to raise their spawn. Pump them full of drugs and see what happens, yea? When those who don't even have the disorder would do with just a bit of discipline and not need the drugs that could fuck them up later in life (see below).
Unfortunately a lot of us, even if we actually did "need" the drugs now are suffering some rather poor affects. My blood pressure/heart rate has my early dependence on Adderall and its ilk to thank. All because people didn't know what in seven hells they were doing for the most part. Then again, experimentation was necessary, wasn't it?