Why did the animals rebel against Mr.Jones and mankind in general

Because they were treated as slaves for human success and consumption. They wanted control over their own success and destiny.

the animals rebelled against mr jones because they were treated as slaves and used for mr jones to get money

Mr.Jones didn’t give food to the animals and always left them cold and When they die he just throws them away. moreover he treats them as slaves for his own success and consumption and they wanted to control the farm by themselves and rule their own destiny