I don't have any problem with science fiction. I acknowledge that it is art. I was thinking more along the lines of useful information. Like in a 1984 or a Fahrenheit 451 situation where books started being censored or eliminated, I would be scrambling for history books, technical references, medical references, etc. Most important would be history books. Art would be lower on my list and science fiction would be lower in my list of art.I take it you don't think SciFi and Fantasy (I prefer SciFi BTW) qualifies?
Sturgeon's Law, 90% of anything is crap.
These books are as much art as anything else man has produced, opinions nonwithstanding.
As for knowledge, you do know what science fiction is? The word Science in the name should offer some clues. Of course, Sturgeon's Law applies here too.
That's not to say I don't like science fiction; of all the movies and books I read, science fiction are usually my favorites. but it's more a guilty pleasure. Science fiction doesn't (in my mind; maybe I don't read enough into it) have all of the metaphors and higher meaning as most of the classics do. It's for entertainment only.