Wishing there really was a hell implies that one doesn't believe in hell in the first place. That's a foolish/dangerous way to go through life.
That statement also suggests one hopes someone else actually goes to hell - if you don't believe in heaven or hell, surely we can agree that wishing that on someone else is very bad karma.
And of course I haven't even mentioned, that modern liberal thought has been thoroughly repudiated by most of the country (at least outside of Mass, NY and California) and it's ideas shown to be defunct.