that is a very contrived argument. You could just as easily make that statement about guns instead of crack and you'd have the anti-gun crowd argument.
just because something has the potential to ruin lives doesn't make it inherently bad.
Contrived?.... not at all, it happens every day.
And guns and drugs in this instance are NOT interchangeable.
Guns can be and are used responsibly every day by law abiding citizens. With drugs there is NOTHING responsible about altering your state of mind for personal enjoyment.