Were you ever in the military when it had a draft? I was. During WWII and before, the draft consisted of ordinary citizens who were motivated and came from across the spectrum of citizenry. I can remember in 1968-1976 what it was like and, to a large part, it wasn't the fine group of motivated professionals we have today. There is no comparison at all. The problem can get so bad with unmotivated soldiers that it affects the whole unit. If the US military today were to become infected (through a draft)with some of the likes of our 'citizens' today, disaster would certainly follow.
No I have not served, yet. But my dad served from 71-74 as a RA not US and favors a draft. You say "Professional Army" to him and he will give you a history lesson on what professional armies have done. Oh and both my grandfathers served in WWII, one was a volunteer and I don't know about the other.