Now that McLaren as a constructor has been penalized and eliminated from "supposed to be" dirty acts from "a few" of its employees, I think it makes perfect sense that the company do some kind of revenge against the perpetrators.
There was no sportmanship involved when Alonso and Dela Rosa tried to cheat by exploiting stolen secrets from Ferrari, why would there be sportmanship if McLaren denies Alonso the win by tweaking his car so he'll be out pace compared to his teammate?
Alonso cannot win races without his car. And McLaren owns the car he his driving right now. Since this entire contest has dirt all over it, I would rather pick Lewis Hamilton and give him a better car to win for the team, if I were Ron Dennis.