Comment on Disinformation vs fraud in the climate debate by oxonmoron

I appreciate this blog and its host Dr Curry and have learned a lot but regrettably have little to contribute of a scientific nature, indeed being long retired, I even find difficulty with my own scientific work at this remove.
Unlike Bart R, the main reason I’m a regular visitor WUWT and similar sites is that they give rise to a degree of optimism about the future and are amusing. Why is it that that the doomsayers, hair shirt and sandals brigade are so miserable all the time? I find that in casual conversation one can’t even use the slightest trace of humour or irony without being immediately admonished for daring to be so frivolous. Why is that?