Fact #2: The ratings system's flaws aren't to blame for the wrong shows getting cancelled.
Do No Harm premiered last week and posted the lowest rating for any major network broadcast in television history. It's bad news for their show's incredibly novel premise of a doctor who's got a "Dr. Jekyll and Mr. Hyde" thing going on you know, like Dr. Jekyll.
"Obviously that show's low ratings are its own fault, for being not my favorite show! But my FAVORITE show has a HUGE fan base and it's on the verge of cancellation because of low ratings!" Oh, you mean something like Community, finally premiering tonight after lots of delays? First of all it's not cancelled yet, so try to take a deep breath.
But also remember that however much you love Community, your elaborate Tumblr GIFs and your independently-produced Alison Brie t-shirt and your love of saying "streets ahead" do not translate into dollars for Comcast and General Electric. They have more ways to show you Community than a first-run broadcast loaded with commercials, but they don't have more than one profitable way to show it to you.
How many Arrested Development fans do you know who watched the show during its original run on Fox? Maybe one or two, at most? If you feel let down because News Corporation cancelled it, remember that they feel let down because you didn't watch any of the ads that pay their bills.
Every TV network is trying to give you what you like. They would be crazy not to, they are in the for-profit entertainment business. The only major restriction is that what you like needs to be profitable, and they are throwing money away if what you like doesn't have enough fans, or has too many fans watching torrented episodes on their iPads while pooping even though it's not sanitary.
Hold it together, though, because there is good news for fans of unprofitably rated television