At least none endorsed a “Boofer” into the highest court in the land.
I’m rather certain we don’t know much of the youthful activities of all those former justices. For that to be possible, they would probably have to have kept sufficiently detailed calendars, decades later been falsely accused of heinous deeds, further smeared with the most implausible accusations, subjected to an interrogation under oath on national television, then condemned in the unthinking, hypocritical court of public opinion despite zero evidence of those original accusations, all of it orchestrated and fueled by trained political assassins in the senate and mainstream media. However, if any were ever in a fraternity, that alone should be enough to crucify them, at least it would seem so according to your standards.
But your deflection to “at least…” would seem to argue against the existence of your own ideal of a “True Conservative,” or that you really hold to any such standard. I see at least two glaring problems in the search for the ideal. One is that the past (aka “the good ol’ days”) is not nearly as good as we would like to imagine, e.g., the Roaring Twenties. Another is that there always seems to be a crisis of opposition that would thwart any ideal. We have been a Reality TV culture for more than a quarter century now, and it was not invented by Trump.