This might be fun:
What are some philosophical views that you really want to be true, but are pretty sure they aren't? Maybe the view would solve a lot of problems, or would really streamline your overall picture, or is just really, really cool; but, unfortunately, it seems to have one (or two) fatal flaws of its own.
This post has 2 points: (i) it will be fun to see what views people pick, and (ii) maybe someone will put up a view with a supposedly fatal problem, but someone else will know of a solution to the problem.
I'd like it if Chisholm's agent causation view were correct. It would help out a lot in the free will and moral responsibility debates (and be so empowering!). But, I feel like it's not true, unfortunately.