Why kids laugh at when seeing others falling/suffering?

Some time ago a teacher friend told me she couldn't understand why there were kids who laughed without helping when seeing a friend fell down.
Now I do. Coz there are TV programs which is showing how funny it is for people to fall down and there are parents who laughed together with them. Say if you are the one who fall that badly, right on your head/knee/or private part, how would you feel with people laughing at you?

To add on that, when you try to tell the kids that it's not alright to laugh at other people in this mode, there are parents who tell you bluntly that "Why dont you ask the program not to show up?". What kind of absurb adult?

Today I let a group of teenagers watched a movie clip on a real life air plane crash, which is about the last 10 minutes of life.
Some of them laughed in the middle of the movie when seeing the passengers falling and hitting.
Blame them to no one, but the TV program/virtual games with lots of hitting and dying, and the laughing parents behind.
I told them straight that you must be something wrong to laugh at someone who is struggling for life.
Frankly, I really do feel sick with teenagers like this. And I feel more sick to see allowing parents who show disrespect of other people feeling.

Observing and contemplating living creatures - Looking beyond the compound eye

Not remembering which day was it, we moved out Jo Von table to the balcony so that she could draw at her own pace and space under the big blue sky.
I was cooking and heard her calling out loud: Mummy, mummy, come quickly and see! There is a big fly!
It took me sometime to finish cutting the veges before going out to see what was really going on.
Well, well, it was certainly a jumbo fly came visiting! A size of Jo Von thumb!
On one note: i was saying "We seldom see that kind of living creature flying around."
On another note: i heard my heart murmuring, "Would we be able to observe this little living creature looking at us with its compound eyes IF she is still in the kindy NOW?"
Well, maybe yes, but surely we know if there is any such chance, she may be able to see the fly came flying in but before it flew out, we will be calling her to get going "FASTER", "faster" and "faster". --- get going to school faster, get going to bath faster, etc....otherwise we will be late.
"LATE"? Did i mention about LATE?
"BEING LATE" --- a connotation that build the society to "KIASUism".