My opinion is simple: if people think they are so "smart" because they earned a 170+ on their LSAT, why do they not have 4.0+ GPA's
There's no apostrophe in 'GPAs.' And not everyone's undergraduate school gives A+s.
and full-ride scholarships to their UG institutions?
Some of us do.
Anyway, I hope no one thinks they are intelligent *because* of a given LSAT score. I know my own mind better than anyone else, and the three-digit number correlated to my raw score on the LSAT is merely a figure to help law schools measure my ability.
People who are actually intelligent and actually achieve good scores on the LSAT likely never view it as you describe - as some sort of 'verification' of intelligence. The reason is not hard to understand - those who are intelligent are usually aware of it outside of indicators like the LSAT.