You are a cowboy, and it's your job to endure hardship on the open range and protect the rancher's herd. In your work, you get to observe the whole herd, including the calves.
You notice one calf that is REALLY stupid, won't stay with it's mother cow, wanders off, won't feed properly, the other cattle shun it.
What do you do?
You bring that calf to the cook, who slaughters it, and it feeds the hands for a couple of days, that's what you do. The herd is stronger for the culling, and survives better. You've done your cowboy job well.
Now, let's look at this process like a liberal.
As a liberal, you make the same observation about the deficient calf, but instead of eating it, you try to promote it. First you try to tie it to it's mother so it can't wander off. The mother gets very annoyed at that, so you tell the honcho that he needs to assign another hand to make sure the runty calf survives. The honcho, also being liberal, goes along with your idea of there being a duty to protect and mainstream the runt. Soon, several hands are constantly trying to help the confused runt. So much attention is diverted from the basic job of animal husbandry that rustlers sneak in and steal half the herd. This ranching operation is a fail.
There aren't a lot of liberal cattlemen or cattlewomen.
Now you know why.