You can say whatever you want to. Say it as an opinion, a thought, or a belief. You're protected by the Constitution. If you state it as a fact, you have to prove it.
(On the bottom of this page, it says: "Opinions posted on Free Republic are those of the individual posters " So, every post here is an opinion. This is an opinion site.)
Maybe what should be added is a reading and comprehensive course for posters as yourself.