There used to be plenty of intelligent pro-EU conservatives, Boris Johnson booted many of them out of the party because they wanted to debate the horrendous Brexit deal that Liar Johnson wanted to force through.
Conservatives historically were seen as economically competent, and there's nothing economically competent about withdrawing from a trading bloc of countries which we do most of our trade with, and are geographically closest to, in favour of trading under worse terms with countries much further away.
I don't expect someone who drinks their own urine to be able to remember anything further back than the last few years.