I think the main reason is people tend to believe they're own story and dismiss everything opposing it as false. Especially the ones looking for public attention spew their opinions as facts instead of trying to respectfully find truth together with different views. There is too much polarisation. So much that it sometimes feels that not having a polarision or strong opinion is being regarded as the enemy. We need to let go of our egos, convictions, opinions and so called facts to find humanity in the others again.