If the messenger be a homeless person on the street, heed them. Whatever, whomever, the messenger be, heed that messenger. Your response to the message could be your key to your own survival. It could be a fatal mistake to ignore the message because you do not approve of the messenger. It is a little like throwing the baby out with the bath water.
Mankind has trouble believing what they see and hear.
The messenger and the message is being rejected, just as Jesus and his message was rejected in his time. Prophecies are just that, prophecies, a prediction of what can be, not what will be, but can be. They are given for man to heed them and by accepting that warning and doing something about it, can change the outcome. It is not God's Will that causes bad things to happen, but man's will. The conditions that arise in the world are because of the law of cause and effect.