Delusions make the human mind that more amazing

[FatAndFaithless]

Because beliefs don't exist in a vacuum. Beliefs inform your actions, they can affect other beliefs, and can affect how likely you are to change your beliefs. And again, as a member of a community who is affected by the actions of others, I'd like to be as sure as possible that the community in which I am taking part is based on reality, and not some fantasy.

Some cases there are negative consequences, but in some cases beliefs do exist in a vacuum. For example, I am someone who likes to play videogames and if I had the delusional belief that, when I see the fantasy world on my t.v. screen from playing a videogame and conclude that this must be some other dimension and this is something that just brings me personal pleasure, how would that cause negative consequences?

You don't get to say 'beliefs do exist in a vacuum' and then give an example of one specific belief at one specific time. You're creating the vacuum in your example, without considering how that delusion might affect your other beliefs or your actions. I don't know what's got you into this 'just let me have my fantasy' state of mind, but jesus, wake up to the real world man.