Because liberalism is a mental disorder, and the only time anyone seeks treatment is when reality comes crashing in on them and they reach rock bottom.
There are a lot of enablers out there, who are not liberal, who don't want to be seen as "mean spirited" or "uncaring"
I don’t think Roberts is liberal. He is just a lightweight who was easily rolled. He said no mas when it became clear his kids would be Palin-ed and he would be given the daily MSM waterboarding.