Anyways, I've been thinking of coming out for a while now and when I do I
want to have a reason why they should leave too. Anyone have any good
points I could make?
Not sure why, but your post doesn't sound real to me. Probably because you don't give a lot of details. In any event, if you are still living with your parents and feel ready to make that decision, you should be able to feel capable of living on your own. Are you an adult? If so, can you support yourself? If so, why are you still living with your parents?
If you are not an adult, then you are to follow your parents rules for as long as they support you and they are legally bound to take care of you. If that's the case, then prepare to leave when you are old enough to do so.
Just telling your parents, the people who are putting a roof over you, that you want to leave, or convincing them that what they believe to be the best way of raising you is based on nonsense may not be on your best interest.
If you know the basics on the JWs by now you should know that it's not just leaving or convincing them; it's about a number of decisions that they have made, including the way they chose to raise you, that you are up against.
Prepare for it by becoming as independent as possible. Living under their roof may not be in your best interest.