This is an interesting thread. Let's first generalize the question a bit:
"Why does DT not get all the respect they deserve?" ->
"Why do people prefer very simple music that only appeals to "base" emotions?" ->
"Why does popular culture in general tend to be very simple, i.e. have a very low intellectual content?"
A great deal has been written about this by academics in the past century. If we look at culture over the past few centuries, we see a steady decline in the complexity and content of art and public discourse in general. In the 18th and 19th century, what is now called classical music was the most popular music around. It is often erroneously thought that classical music was only for the elite, but in fact it was the most widely distributed music around. So we've gone from Beethoven and Liszt to Bieber and Kesha and we've gone from Dostoyevksy and Wilde to 50 Shades of Grey, from Jefferson to Trump. Many prominent anthropologists/sociologists (Eliot, Postman, Llosa, etc.) even refer to this phenomenon as the "death of culture". While I wouldn't go quite as far, it's obvious that the content of mainstream culture and discourse has declined. Now for the "why": the general consensus among academics is that the decline is primarily caused by a change in society from introspection and rationality to a preference for pure entertainment. Our whole society has become geared towards simple entertainment, and the primary goal in life is to feel good and look good, i.e. to maximize pleasure. The consummation of serious culture requires effort, which reduces instant pleasure. Furthermore, it's effort that does not make you any money, which in our hyper-consumerist culture has become the prime motivator of action for most. People prefer to numb themselves while serious culture is confrontational. It forces you to think about things like death, morality and community. Also, going outside of the mainstream reduces your status since it makes you an outsider, which again reduces pleasure. The pursuit of pleasure breeds conformity. This, in a cramped nutshell, is why I think DT does not get the respect they deserve.