Paul Graham:

Every cherished mistaken assumption has a dead zone of unexplored ideas around it. And the more preposterous the assumption, the bigger the dead zone it creates.

There is a positive side to this phenomenon though. If you’re looking for new ideas, one way to find them is by looking for heresies. When you look at the question this way, the depressingly large dead zones around mistaken assumptions become excitingly large mines of new ideas.