I went to their site and used their e-form to send them a note. I was respectful but reminded them that their was no need to do this and that they have foolishly brought any negative consequences upon themselves.
I did similar. I reminded them that while they were within their rights to abandon advertizing with someone with which they did not agree, I was within my right to avoid buying cheese from a company with which I did not agree. I also noted, in case they weren't too bright, that they were one such company.