Nursery Rhymes: What the hell is wrong with them?

I'm sure quite a lot of (Indian) people remember the nursery rhyme, "Ring a Ring o' Rosies".

Here's how we were taught the rhyme. 

Ringa Ringa Rosies

A pocket full of posies

Hasha Busha

We all fall down

Right about now, you must be wondering what the eff "Hasha Busha" means. I tell you, I wondered the same for many a year.

It was just recently that I finally came across the right lyrics, while reading Dan Brown's "Inferno".

"Hasha Busha" is actually "Ashes, Ashes".

The book continues to explain that the rhyme is actually a reference to the Black Plague that ravaged Europe in the Middle Ages.

Then I thought, "Wow. Why are they teaching that to kids?". I tried to recollect some other rhymes. Many that I remember seem to have somewhat a sinister mood to them.

Jack and Jill went to get some water, but ended up breaking their heads. Jack certainly did. Maybe Jill survived.

Poor Humpty Dumpty was sitting on a wall and fell. Nobody could put him back together.

I don't know if many people know this one. 

"It's raining, it's pouring.

The old man is snoring.

He fell out of bed and bumped his head

And couldn't get up in the morning"

What the hell kind of rhyme is that? Why, oh why, would you teach kids such stuff? There's something wring here. But of course, there are decent ones. "Baa baa black sheep", "Twinkle twinkle little star", etc.

I youtubed "nursery rhymes stand up" comedy and came across a Ricky Gervais one. Check it out, its pretty good. Deals with the same stuff I did here. And no, no plagiarism, I assure you. I just stumbled upon it, just like Mr Gervais probably did.