EXTREMISTS AND FACTS: MUTUALLY EXCLUSIVE ?

One thing I notice in reading around the web is that liberals make a science out of discounting facts they don't like.  It doesn't matter if the facts are supported by evidence or not.  Many times they completely ignore them or, discount their relevance, so they can avoid dealing with them. 
This is why it is impossible to have a discussion with a far left liberal.  In an intelligent argument, both sides must agree to accept facts that the other side has proven to be true.  I've noticed a pattern on many blogs that when the facts come out liberals head for the hills.   You can argue opinions forever but, facts must be accepted by both sides when having a debate or discussion.  This explains why we are not getting anywhere in our political discourse in this country.