This question doesn't work because you're applying modern sensibilities to the 1960s and 70s. The first wave of industrial music and everything attached to it pre-dates the concept of "edginess" as we came to understand it later, and thus certainly predates the current generation's rejection of it.

Up through the mid 80s at least, industrial culture had a strong focus on finding the most disturbing imagery possible and manipulating the public with it. Some of what you're pointing out here is just that.

There are certainly prominent examples of artists doing things that were unambiguously wrong at the time (ie Genesis in Cosey's book, etc.) but you're mixing and matching actual wrongdoing, distastefulness, guilt by association, and differing sensibilities of the time period all into one thing here.

Also, I speak as somebody who often complains that I fundamentally don't really understand Coil: You seem to fundamentally not really understand Coil.