> Cats have been domestic pets in the UK since at least the times of Roman civilisation, and have been allowed to roam free for much of that time. The human po

> Cats have been domestic pets in the UK since at least the times of Roman civilisation, and have been allowed to roam free for much of that time. The human population in UK has increased more than 10x since then, if cat population increased accordingly there are way more cats killing things today than back then. The more humans around the more careful we have to be about our impact on the environment, so we have to be 10 times as careful today as we used to be historically.