(1) Smart can never hurt.
(2) This is an awful market - firms are laying of first years and rescinding 2L offers.
(3) Putting your LSAT score on your resume doesn't mean that you're automatically considered to be unpleasant to be around
(4) I don't have latin honors for UG, but maybe one or two people will think I'm more likely to get them because my LSAT score's 10 points above my school's 75th percentile (whether this is a valid thought is immaterial; I'm just interested in getting my foot in the door)
(5) This whole "social stigma" ding notion is highly suspect. You noted yourself that Yale's career services doesn't ban the practice. They say some employers find the information somewhat useful. And by including it in their info sheet, they even implicitly encourage people with 180s to put that on their resume (perhaps).
LSAT doesn't fit into that rubric, and your inclusion of it draws attention to your low undergrad GPA (signaling you won't put in the hours) and gives you questionable "flight to China" value for office dynamics.
But that's not the only possible interpretation of the high LSAT score at lower ranked school. That's especially true in my case, where (1) I have a decent scholarship and (2) I have ties to the area the school's in.