A UC Davis "study"? The methodology must be to establish a pre-conceived result, then gather as much information as can be found to support that result (not unlike many politicians).
Expecting liberal leftists to report objectively on any topic can only result in disappointment. To the typical liberal, one person's "feelings" are every bit as valid as any empirically-proven fact can ever be.
Liberalism exists as a means to permit the self-perceived liberal to believe himself/herself to be morally and intellectually superior to the common person. The real danger lies in the natural extension of this belief and that is when the liberal, being convinced that he/she is morally and intellectually superior to the common person, he/she has a moral duty to control the lives of us lesser humans (for our own good, of course).
I guess what irks me the most is the use of the word "liberal" to describe such people. The word "liberal" derives from the same roots as "liberty", which is a concept that today's liberals seem to despise.