I dunno... maybe because they are literally out for blood?
And clowns can be scary and repulsive toolike them.
The Republican party's policies CAUSE it. https://rednoseday.org
Clowns can be warm, caring and funny which is more than I can say for the 'Con party. When I was in nursing a local one would come and visit the Ped unit at least once a month. She was wonderful. She'd make animal balloons and such and the kids, some feeling awful and even dying of cancer, would sometimes laugh and smile for a bit. I
Personally I think they should just go with the red hammer and sickle of their communist master Putin. At least it would be honest.
They are sucking our country dry, so this just seems an appropriate mascot.