Or more simply, the ends do not justify the means, even if, as you point out and I agree in principle, the ends in this case are potentially good.
The prospect of Trump in power in what's arguably no longer a republic run under the Rule of Law has gotten a lot of people to reconsider their position on this (and I share a concern, despite or perhaps even more because I voted for him), and I'll close with the classic Man of All Seasons quote:
Roper: So now you'd give the Devil benefit of law!
More: Yes. What would you do? Cut a great road through the law to get after the Devil?
Roper: I'd cut down every law in England to do that!
More: Oh? And when the last law was down, and the Devil turned round on you — where would you hide, Roper, the laws all being flat? This country's planted thick with laws from coast to coast — man's laws, not God's — and if you cut them down — and you're just the man to do it — d'you really think you could stand upright in the winds that would blow then? Yes, I'd give the Devil benefit of law, for my own safety's sake.