What is that in his hand, to hit the horse.
It's a riding crop. They're very flexible and because of that they don't usually hurt the horse as much as it appears - it's only like slapping them on the backside with your hand!
In the UK, if a jockey has hit his/her horse with excessive force (effectively flogging it) or too much (they are only allowed to use the crop a certain number of times over a certain distance), they get fined and banned from racing for a few weeks.
I disagree with you that owners and trainers don't care about their horses - they invest a heck of a lot of money, time and effort into the animals, are they not entitled to some return?
Would you put your savings in a bank account which didn't pay you any interest for example?
If you want to see some real cruelty to racing animals, check out what goes on behind the scenes in greyhound racing.