This kind of argument can lead us to very bad place. People that work for the mob breaking people's kneecaps if they refuse to pay probably don't have better paying options too. But that doesn't excuse them. Participating in immoral activity for money isn't any better than doing it just because you are evil. Actually, I would venture to guess overwhelming majority of evil is done just because it puts food on someone's table. That does not excuse the ones who is doing it. Everyone who is participating in it shares the blame. And so does everyone who votes for it, too.