It's a statement of facts, not an accusation. Pet owners (animal slavers) are demented (mentally-ill)--that's an accusation I stand by. The fact that you find that statement an "accusation" and "weird" betrays your cultural-biases. Why do you think it's acceptable to enslave animals--why do you think you have a right to do that?

The majority of people do not enslave animals. I would guess it to be a minority who actively engage in the practice. I'm curious now. I'll edit this after I've found some data...

According to the American Veterinary Medical Association 43.7% of American households own a dog and 34.1% own a cat. Isolated that does indeed indicate a minority (though large) are animal-slavers. The figures as presented are probably biased (coming from a business-representative body that profits from animal-slavers) and the households that both own dogs and cats are probably represented twice.

Only 2% of American households choose to enslave birds--that is a minority. I'm not surprised as enslaving birds is particularly depressing. I would accuse bird-slavers of being sadistic as in this species it is extraordinarily cruel. My father and grandfather were bird-slavers and they were both sadistic and cruel people. My curiosity has been sated.