I've got jasmine on my deck. It was a gift to my wife. It's a pain in the ass to keep alive, but I do it because I'm fond of the jasmine. Does not mean I relate to the jasmine. Doctor Manhattan has a human habit. He's clearly not one of us, though. Given the choice between helping humans or hurting humans he'll help because he's not malevolent... but he's got no skin in the game. That's one of the allusions Moore and Gibbons are making about power - the more of it you have, the less the little people matter to you. It's something Moore didn't feel with Swamp Thing. Swamp Thing is very much not omnipotent. As super powers go, he's basically a more durable version of Bigfoot. He's also barely interested in protecting humans - he mostly cares about nature. Moore makes a point with Swamp Thing that if Swamp Thing weren't there, "bad things would happen" but bad things happen anyway. With Doctor Manhattan not there, the world teeters towards armageddon.