There were not righteous enough! Almost but according to god almost doesn't cut it.
Just look at babies, even when they first pop out all sweet and innocent they just aren't good enough either, so what does that tell you?
The wicked are estranged from the womb: they go astray as soon as they be born, speaking lies. Psalm 58:3 (King James)
Oh those EVIL little babies!
When I was younger, I used to get ill so that I could get out of school. Things change with time though. I no longer get ill to get out of school; I get ill to get out of work.
Oh, you mean real illness? Probably as punishment for the sins of Phelps, Falwell, Robertson et al. Being all-knowing, God is constantly tuned into their nonsensical bullshit and it angers Him. As such, he is forcing nonsensical punishments on all humanity until we stop jackasses like these from propagating.
If this looks like a long and boring text, you can skip to the bold part.
Let's trace your question through history.
First we had Greeks, now they had many slaves that did all the work so they had to much free time on their hands and plenty of sand to write on. First we have Epicurus who said:
"Is God willing to prevent evil, but not able? Then he is not omnipotent.
Is he able, but not willing? Then he is malevolent.
Is God both able and willing? Then whence cometh evil?
Is he neither able nor willing?
Then why call him God?"
But he didn't answer our question. Then we go to the east and find Buddha sitnig under a tree:
He said that there is no evil. Just stupid people. He saw diseases as something intrinsically inherited in life something that had to happen.
Guess he didn't answer our question also, but the time-line that we ride an is still young.
We now found Aristotle in bed with a young boy and we asked him, whence cometh evil?
He answers that nature is chaos and therefore somebody has to get hurt and that diseases are born from little invisible eggs.
He was very close, but then dark ages happened because of some guy name st. paul, and after him some madman called st. aurelius.
They claimed that sin is behind every thing bad that happens to people. So if you get sick you probably did something god didn't like. But he never answered why a baby dies, and we all know that in those ages babies died every second.
He didn't answer this because the bible already gave an answer. An unbaptised baby caries the original sin (thanks to st. paul) so it goes to hell. Simple as that.
Finally after dark ages people started to realise that bad smell has a lot to do with people dying from diseases. But they still thought about evil. Now this son of bitch came in to play. His name was Heinrich Kramer. He wrote a book called Malleus Maleficarum and now the main cause of death from disease were witches (read innocent people who didn't understand religion very much) and they were hanged, choked to death or burned alive.
In the end of our sad story we realise that Evil does not exist. It's a dogma made up by church people, mostly theologians.
Scientific observations teach us that everything alive wants to live, even the littlest and tiniest microbes. What you call a disease is a process in which your body's immune system is fighting the little microbes. Now because this was not know during most of our history people called it evil because it didn't have a logic behind it. It's suddenly spread by air from nowhere, it killed in most of the cases and it didn't choose it's victims, everyone was affected, how ever religious or antisocial you were, how ever old or young you were and so on.
p.s. In my country if you don't respect somebody you write his (and it's mostly men with me) with small caps ;)