There are a lot of highly creative types among ordinary center-left liberals, and even among those who buy into more extreme leftism in dupeish fashion.
But the true hard leftists are soul-sucking demons who wring the richness out any art form they adopt, leaving it a dry, lifeless husk. Witness what they did to folk music in the 60's.
Too true. Look at what's become of television, sculpture, dance, popular music, auto design, and many other art forms. In my over-half-century of watching the evolution of these art forms, they've undergone marked and noticeable decline and degradation.
Even creative areas such as advertising, clothing design, broadcasting, appliance design, and the design of public buildings and spaces have seen departures from traditional axioms of artistic composition, which has resulted in a pervasive weirdness factor that's hard to describe.
That's not to say that some excellent art doesn't still manage to bloom here and there, but per my observations, there's an overall downward creep to most of it, which I feel is the direct result of the corrosive influence of hard core leftism.
For instance -- although I've had an intense love of music my whole life, it's gotten to the point where there's little new music that appeals to me. I realize that some of that is due to my age and tastes, but a lot of it is due to the fact that real artistry has been, for the most part, banished from the popular music industry. One exception is Country music, which is still resistant to influence from the left. Consequently, I now prefer that genre over any other.