What many people don't get is that reflexion is negative. Black Sabbath was as negative as negative gets (with Ozzy thrown in the middle; Ozzy's shallow without the three negative guys - Tony, Geezer, Bill). Which is why they're so talented, bother! Who else would write about what madness or misery is really like, in the middle of positive hatred towards madness? Now that's real love. Who else would write "Sabbath Bloody Sabbath" or "Paranoid"?
There're people that're too positive. Being too positive is without reflecting what the world is like, without being reflecting, and that makes one easily abused and swindled. Easily manipulated. That teenage positivism, rushing into "good-doing". Without noticing how somebody might get hurt. How life can be broken. What cruelty really is like.
No negative reflexion, no noticing what the world is really like. So one can't really be positive without awareness. One can't build without being aware of what everything around is like.
One can't really be kind or creative without being reflective, merciful and loving without negativity.
Being too positive all the time will only drive one to an easily exploitable hatred/scorn. Towards anything that "doesn't conform" with ideals of "goodness". Which is what politicians exploit. Most people get that super-positivism gone in their twenties. Things happen that make one realise not everything in life is an uber-achievement and "strength". Life "crashes" one as it's said in Russia. If one's too pretentious. But of course there are people who turn everything in life into struggle. That kind of attitude makes one burn out pretty quickly, too... And it's a risky road which can lead to hypertension, stress, cardiovascular problems...
Black Sabbath's talent was in reflexion, reflecting what humans and their ailments and fears and whatnot really were like. And it takes reflexion to see what they were really singing about. Often states of affliction ("Disturbing the Priest"), madness ("Paranoid"), misery from misguidance and corruption in life ("Sabbath Bloody Sabbath").
The "positive hatred" is hating when someone's "not good enough" or for "not doing enough" or for "not participating". In short, that's when someone's so positive, he overflows and tries to draw everyone into his state. The European hatred towards madness has to do with this. Madness is, in essence, a state of reflexion of what has knocked one's mind out. "Playing out". It's often a consequence of mind rape, suppression of one's will. Madness is cured easily - by reflecting what somebody state's like. Someone else (and usually close) being a mirror (listen to Velvet Underground's "I'll Be Your Mirror"). But positive hatred locks madness away. And never solves it; it only breaks it up and leaves it latent in some cellar of [sub]conscience.
People can take everything backwards - they think artists like Black Sabbath somehow lure into trouble. It's the other way around: just like Dostoyevskyi in the 19th century described characters who couldn't live or be themselves, Black Sabbath described states of affliction that shouldn't be. They also help identify the states when somebody runs into them. Music and poetry give clues as to how everything is. And that's the first step to recovery: awareness. And, of course, you don't become a Dostoyevskyi character (wishfully anyway). Or run into a state described by Black Sabbath of one's conscious will. No; Black Sabbath dealt with fears - with wishes of what shouldn't be. And their role was important in making people realise that fears can be rationalised, portrayed, exposed, shown for what they are. That fears don't have to be feared and suppressed, they can be examined and reflected and seen as something separate from oneself; a reference; and then they won't be dangerous.
Now, something that there's in Tarot "Moon" card (symbol of reflexion) is that it's a very negative card. It's the card of a state of reflecting everything around, a kind of negative state that can be the beginning of awareness. Mirror. But not a source of energy by oneself. Sometimes in life one gets to a point where one can't seem to gather the energy or the awareness to go on. And being ever more active only turns out to thwart enthusiasm. This state might be when reflection has to begin. Not being a sun, not being active, not being of an energy that can achieve something, but observing how everything really is, observing life for notions that one might not even know yet.
Real awareness is really both, negative and positive. So in a human conscience there really has to be a combination of both - reflexion of what's going on around, and what everything around is like (Moon), and active, positive knowledge that can turn into creation anytime (Sun).