Because it's what they live for. They're pro death, pro euthanasia, pro abortion, pro porn, pro sodomy, pro lowering the age of consent, pro drugs, pro swearing, pro filth in movies -- everything that is sordid and ugly in life, they are for.
Where did you get the idea that Libs were compassionate towards human beings? Libs are only compassionate towards non-human life, such as trees, fish, wildlife, etc.
They claim to be “compassionate” (with other people’s money, of course).
You have a big list there, but it can be summed up as supporting the destruction of everything traditional in our society,
with the goal of replacing those traditional values with their own authoritarian utopia.