I mean sure, a single letter would not stop a company that is a known patent troll. On the other hand, a lot of letters may at least be felt, at least by employees handling the mail.

Or maybe not, maybe they’ll be laughing all the way to the bank. But you know, it’s not like it would take so much time or effort that it would be much of a shame if it did nothing at all.

These people are purely evil; they don't care what you think of them, and will just laugh at your letter before they toss it in the trash. You'll just be wasting your time.

You will waste more of your time than theirs.

I would applaud you sending a letter, but honestly this company might not even receive mail at their box or just outright discard items coming from unknown parties. I feel like you'd be putting some effort into this and they wouldn't even notice or read your letter.

These sorts of trolls tend to operate with a minimal amount of staffing since they're usually subsidiary spin off companies (so nothing but bare bones is allocated in terms of payroll) and since patent trolling is such a gamble (if you're trolling 200 patents with the expectation of getting one or two hits then you should try and minimize costs)

They know what they're doing, and they don't care that it's wrong.