Cf. false-flag operaitons, or in spamfighting, something called a “Joe job” based on a case in the 90s of a spammer taking revenge by sending spam that falsely appeared to originate from joes.com.

I am aware of that danger.  I meant no more than to more or less subtly hint that investigators should examine such things for leads—knowing that the leads may be salted with intentional disinformation.  Perhaps I was too subtle and too terse, out of a desire to avoid giving malicious parties instructions for how to avoid (or exploit) what I was trying to suggest.