He should certainly be allowed to say it. Nut jobs like him are essential if we are to have the opportunity to retort and reiterate the reasons why he's talking bollocks. All those who choose to listen will be therefore educated and armed with answers when another nutjob talks bollocks. See? We're protecting our civilisation by supporting free speech.
Free speech does not mean free from consequences, however, and if everyone thinks you're a wanker because of the bollocks you talk, losing your high-profile job will follow axiomatically. Good. You nutjob. Go work somewhere where only the two blokes who work with you have to put up with your bollocks.