Hi Emmie, don't apologise as you have not said anything wrong, although this issue does seem to be a slight bone of contention!!! I live in the U.K myself and my cat goes outside, I don't know anyone who keeps there cat indoors! In fact someone on here made a good point that vets in the USA would recommend keeping cats indoors due to the vast amount of predators that they have, which of course, we don't! Whilst here in the U.K a vet would certainly not suggest to keep a cat indoors! Whilst I agree there is danger everywhere, should we all keep our kids and the rest of the family tucked away safely indoors? I think that we are all coming from the same angle of being concerned about our cats welfare, which I know we all love very dearly. We have different points of view due to different circumstances, but we all just care, so its cool!!!
About the car issue!!! I don't think that there is really much you can do, a warm bonnet is always nice for a cat, although mine doesn't do it!! I think maybe rather than removing your cat, you could try clapping your hands anf getting it move itself, that way it might remember that its not a good idea!!! All the best with it.