This technique, of justifying a behavior we all know is wrong, justifying it for the sake of convenience or a "greater good", Pope Francis assigns to the Devil Himself.
‘Only look,’ he [the devil] will say, ‘just do this one small little scam…it is a small matter, nothing really.” And so he begins to lead us on a road that is slightly off. This is a pious lie: ‘Do it, do it, do it: there is no problem,’ and it begins little by little, always, no? Then [he says]: ‘But…you’re good, you’re a good person—You [get away with] it.’ It is flattering—and he softens us by flattery: and then, we fall into the trap.”
I write more on the dangers of Dancing with the Devil here.