You could say that, but my cat thinks you'd be wrong.

However, I'm yet to see my cat boot up the computer.

Ultimately pets are for humans, whatever you do for your cat you do for humans. The same logic works there.

With cats it's the other way round: the humans for cats.

And from a computers perspective all human work is ultimately for computers. Either making them or feeding them data. The purpose of the cat is to generate cat pictures for the computer etc.

My cat would often turn the computer on or the tv off, and I swear he did it on purpose because that's when he was complaining he didn't got enough attention.

My cat has turned off my computer on me - does that count?