Sebastian,
Just want to say that I completely agree with your reaction. There is a way to treat customers and vendors. But when a company that you have no relationship with damages your business (whether on purpose or via negligence), you should react strongly.
Trend Micro (who has deemed some of my pages as “dangerous” and “virus vectors”), leaves you with no way to effectively contact them. I got the idea that if I was a business or enterprise customer, I could take care of this quickly (is this subtle extortion?).
When Trend Micro is taking money out of your pocket and food off your table, almost anything short of being militant is acceptable.
Cheers,
-Gary.