If you have a talking point that is objectively wrong (like you do) and Striker adopts it as his own (like he has been doing), then that's not him making up his mind, that's him being ill-informed. If he intentionally adopts that objectively incorrect point (like he probably is), then he's also deluded. The phrasing "making up his mind" indicates that the topic lies within the realm of opinion. If we are discussing a topic that is not based in opinion, and your position is the objectively incorrect one, then you are ill-informed.
Translation: Everyone else but me is wrong all the time. I cant stand it when people argue with me because I am always right.