Killing is bad, but what about self-defense? Lying is bad, but what if you don't want to tell your best friend her dress isn't so flattering? It's impossible to draw the line on when you can perform a "sin" or not.
As much as I want to read why we should let Cosby slide because "innocent until proven guilty" or how we should march guns into schools because a district allowed a Sikh student to bring his religious dagger to school....I don't. Consider that you might be wrong and do research.
Whether you're straight, white, upper class, male, cisgender, or anything else, everyone has some sort of privilege. The best way to move forward in society is to recognize what privilege you have, not get defensive about it, and to understand others' struggles.