The big thing is you can&#x27;t convince someone who doesn&#x27;t want to be convinced.  They have already made up their mind, dug in their heels, and are willing to fight to the death.<p>In some cases they would consider themselves a bad person if they didn&#x27;t defend their ideals to the death.  This is especially true if there is a religious aspect to their view.  They don&#x27;t call it a &quot;reasoned position&quot; on religion, it is belief.  Belief is strongest when you keep it despite overwhelming evidence to the contrary.  This is a core tenet of Christianity and I suspect most other religions as well.  Your faith will be tested by &quot;deceivers&quot; constantly and you must keep it.<p>It&#x27;s impossible to use logic or science to convince someone of something when they think logic and science are tools of the devil.<p>It&#x27;s also the Amiga effect.  When a community grows smaller the remaining members are the most ardent.  Once you are down to just a handful of remaining members all that is left are the die hard fanboys.  All of the reasonable people left a long time ago.