Why would you kill them?
Because they have no way of looking after them, and don't fancy going to the lengths of keeping a litter of ever-growing puppies that eat loads and stuff everywhere. It's likely the culture there, but the poor sensitive children and people who rub their richard against cats and dogs every day in western countries cry big boo hoo tears whenever they see an animal treated badly, despite the fact that thousands are killed, abused and otherwise manhandled right beneath their noses.
Seriously, cry some more.
Also, she has a damn good throw, she's 25 by the way but still.