This is called "the ends justify the means" in legal terms. It is used (illegally) regularly in criminal cases and 99% of the time the government gets away with

This is called "the ends justify the means" in legal terms. It is used (illegally) regularly in criminal cases and 99% of the time the government gets away with it. It is technically frowned upon though for the possibility of it running away with itself -- where is the line drawn once you say the line we have (laws) can be crossed.