When a messenger warned Armenian king Tigranes that Roman General Lucullus was mounting an attack against him, Tigranes had the messenger beheaded. He killed the messenger because he didn't like the bad news.
Some who deny the adverse impacts of climate change have adopted a similar “kill the messenger” attitude toward climate scientists. In response to warnings about global warming, deniers have resorted to ridiculing, stigmatizing, and vilifying scientists who are delivering messages they don't want to hear.
Incidentally, Tigranes lost the battle decisively to Lucullus.