The same could of course be said of alcohol, caffeine, nicotine, a large number of non-prescription drugs and virtually all other drugs that affect your brain in any way. (switch a few organs around of course)
why do people feel the need to point out that other things are also bad?
yes, alcohol and tobacco are bad too...and? not many say otherwise
if you drink enough water you could die...so what? we are talking about pot, not other bad things