If the end does not justify the means - what can?

The ends justify the means

Survival justifies any means.

If they're gonna get you, they wanna get you, ... And they use Machiavellian technique. The ends justify the means. That's what this low-life country is all about, John. That's the reason they have me in Marion, John.

The end justifies the means. Sometimes you have to do the wrong thing to get the right result.

One thing more dangerous than getting between a grizzly sow and her cub is getting between a businessman and a dollar bill.