... they cross the line.
In fact, they cross a lot of lines.
See "This is blatant scientific fraud." And gain a better understanding of the mindset that drives the now-discredited global warming movement. And a better understanding as to why its leaders felt the need to manipulate data.
The fictional Elmer Gantry, in his day, let on like he was a crusader for Christ. He, like Dr. James Hansen, had a huge following of true-believers. Until he was exposed for being the fraud that he was.
In the case of Hansen, because he's inflicted so much damage, the demise of his credibility - if not his lucrative gig - couldn't have come soon enough.