If McMaster Jr were a threat to the Deep State, then it might have some plausibility. Q did not mention a threat. He only said that he failed in his mission.
Are there any examples I’m missing of the DS retaliating for simply failing in a mission?
Probably a DS message to all! If put out of the fold by POTUS, dont even think about turning!
When it comes to the Deep State, I would say that nothing is past them.
You expect that the DS has scruples or some such thing?
I can’t think of any reason to assume they wouldn’t use retaliation to accomplish their goals.
No moral reason not to use it.
No practical or strategic reason.
Reasons in favor of using this tactic would be both retribution and deterrence.