In your example, explain that you were working in the interest of all involved parties. Consider the welfare of your coworkers, the needs of the team, and the necessity of bringing your issue to your superiors. Your expressed motive should always be for the betterment and welfare of the team.

"I had a co-worker who seemed to be struggling. They seemed sleep-deprived, and their attention to detail wasn't what it once was. I tried to talk to them about it, but they weren't forthcoming about what was going on. I reviewed their work, just to help them out, and fixed a lot of mistakes. It got so bad that I decided it was time to bring it to the attention of my supervisor. They pulled us both outside and gave me a chance to speak first. It turns out they had some pretty serious health issues. They didn't want to miss work because they needed to maintain their hours to continue getting their health benefits. That's when our supervisor let us know they had a program for situations like this and that they wouldn't lose their benefits for missing work."