re: What is the worst argument you've heard for a postion you support?

Atheists using the problem of evil to argue against the existence of God. It's a shitty, intellectually lazy argument for a position where so many better arguments exist.

Gun rights supporters just posting "shall not be infringed" as if we haven't always had some form of limitation on the right to arms.

Those who argue for maximum personal liberty but support things like seatbelt laws, open container laws or government surveillence.