::*Firstly, you have no sources stating it's primarily. There are many sources which state it has gained such a connotation in addition to what it used to be, but none claim primarily. Two obviously ultraliberal sources dedicate very short sentences to it stating it's a pejorative — they are WP:FRINGE and WP:BIASED. You removed 9 sources of which none were dictionaries. The dictionary would be tenth. 
 ::*But Allan Bloom wasn't a "conservative" as we know the term. He held academically traditional views as to what should be taught in schools. He was against educational change. Using words like conservative is ambiguous, breaking WP:DISAMBIG. 
 ::*You call academic sources defining the term as something akin a philosophy and not as a simple pejorative "scattered usages?" Mind you the literally dozen sources I gave you were from the first two pages of the academic search engine I used.  
 ::*The term's use by people other than "conservatives" is well-documented as well. Finally, not as a source but as an anecdote so don't bust your balls: on Monday I saw Colbert use it non-pejoratively on his new talkshow.