He WAS that bad. Your ignorance of recent history doesn't excuse his wrongdoings. I'm not trying to be a dick, but McCain was an exceedingly loyal servant of the Military Industrial Complex. He was instrumental in the deaths of thousands. But as those thousands are Yemeni, Iraqi, Afghan, Libyan and the like, I guess it's not worth caring about for some. His guise of patriotism isn't enough to fool me though, and I don't believe in the notion of honoring a man just because he's dead.
John McCain was a war criminal and he should be remembered primarily as such
EDIT: I'm not saying you don't care, it's tough to get good information out there in a media landscape of misinformation, propaganda, talking points and cover-ups. We're obliged as citizens to try though. Real journalism is out there with the truth the Jake Tappers and Wolf Blitzers of the world won't tell you