People recognize that cannabis is habit forming, it's just not as physically addictive as the things we label "dangerous addictive drugs." Most people are addicted to caffeine and we generally accept that it's fine. In the same way that moderate drinking for almost everyone doesn't turn into alcoholism it's the same for cannabis. In contrast everyone who smokes nicotine with any regularity at all will become addicted to it.
"average user lazy and complacent" -- That's like why we're here man.
I don't know a single person who thinks it's fine to drive while high, I do know some stoners whose tolerance for "sober enough to drive" is suspect but that happens when we hit the bars too.
I think you're applying the word harmless to a degree that no one else does and then are arguing against that. Like that cheeseburger increases your risk of heart disease but no one's out here being like "cheeseburgers considered harmful."