Probably more of "It's none of my business."  People in those time periods tolerated a lot of things they shouldn't have; spousal abuse, child abuse, etc..., because they didn't want to be involved or it was "None of their business."

Kink is a very old thing; but, was more often than not fulfilled via brothels, which were sort of openly tolerated, or willfully ignored.  When civic forces pushed them out, it turned inward.  I think people are more comfortable with the idea of it being out in the public consciousness; but aren't necessarily more tolerant of it.  I think they are probably less tolerant of the puritanical forces, who had a long history of pushing their agenda too far, until people fought back.

In any era, if you were wealthy or important enough, you were eccentric.  if you were poor, you were perverted.

Marston wasn't the only kinky one in comics, for sure.  There were quite e few writers and artists who got their predilections out on the page.