Quote from bungrider:
inappropriate means can often produce undesirable ends later on...
for example, the resurgence of al queda since the liberation of terrorists in iraq.
He didn't ask if inappropriate means could produce undesired ends - that's axiomatic.
He asked whether if you got the ends you desired does that by itself justify whatever means you used to realize them. It's the age old Machiavellian question.
For example, does catching a serial killer justify torturing suspected (but not yet proven in court) criminals to get the information you needed to nail the killer? If so, would it justify torturing a few mistakenly suspected (i.e., completely innocent) people along the way? How about busting into a few people's homes in the middle of the night without search warrants and ransacking their places and tossing the people around only to find out you had the wrong addresses - but as long as you eventually caught the criminal you were seeking, would that be OK?
The answer to the question is a nice shade of grey - IT DEPENDS. It depends on the particular ends in question and the particular means involved.
In the above examples, I'd say that the end did NOT justify the means because you're breaching constitutional rights of a broad spectrum of people without reasonable cause.
However, there are other situations where I would likely say it did - such as after catching a kidnapper who then tries to cut a deal before he tells you where he's buried a kidnapped child who will run out of air in the next 6 hours - for that, I'd say beating the holy sh!t out of the guy until he tells you where the kid is would be completely justifiable.
In this case, you're only breaching the civil rights on a single blood sucker who's already admitted he knows where the child is and is trying to use it as a bargaining chip to cut himself a deal and had thus abrogated his rights (and if it was my kid, I'd want to be the one getting the info out of the guy - think pliers and a blowtorch).
On the other hand, letting the police break into and toss every house in a 2 mile radius of the area they're guessing the kid is stashed would not be justifiable.