Ancient kings might kill a messenger that brought them bad news. When a messenger brings messages that we don’t want to hear we try to discredit the messenger in an attempt to reject the message. Look at Jesus. False witnesses spoke against him; some demonized Him. They attacked His lowly origins; they put Him down because of His region of the country. All of these are old tactics that really never go away; they only return in new forms. These tactics were to prevent other persons from listening to His message. Evaluate a message based on its truth, not if you like it; truth is truth; a true message will survive after the messenger is dead and gone.
“As it is, you are determined to kill me, a man who has told you the truth that I heard from God.” John 8:40a (NIV)