Okay, so you're into the deontological line of thinking. I'm not. The fact that you think your approach to morality is the default just suggests that you haven't actually had a meaningful engagement with current literature on moral reasoning.
My argument is "if everyone in the world is doing something immoral, it is still immoral for you to do it," which works equally well in consequentialism. The fact that your actions are statistically insignificant compared to the whole only means that the immorality/morality of your individual actions are small compared to the whole of humanity. That's a false comparison, I'm not aware of any ethical system that determines morality by comparing your impact against the totality of humanity. Maybe comparing your impact against the impact of the average person, but not the total. Under such a system only the Hitlers and Ghandis of the world would even register.
