No one needs to make a living this way.
I’m curious how far you’re willing to carry this.
Companies make the incinerators that Stericycle uses. Are they responsible for the way their incinerators are used? How about the owners of the building Stericycle operates out of? How about those who wash the windows at the Stericycle building?
I used to work in management for a company that had an account for monthly cleaning of the carpet at a small office building. One of the office suites was occupied by Planned Parenthood. Was it wrong for me to facilitate the operations of PP by cleaning their carpet once a month?
Believe it or not I spent quite some time thinking about this topic. The answer I came to, right or wrong, was that I would not be willing to take an account with PP. But that since my account was with the owner of the building, and PP was just another suite in the building, and that my services had nothing to do with what PP did, I was morally not involved in facilitating their operations.
YMMV