In the article "A teen and a trolley reveal society’s dark side," it talks about how people often have to make tough choices between right and wrong. I believe that no one is completely good or completely bad. Everybody has a mix of both. Sometimes, people do good things, but they can also make mistakes or do things that aren’t nice.
For example, when faced with a difficult decision, like the trolley problem, a person might choose to save a few people at the cost of one. That shows that they are trying to do good, but it also means they had to think about sacrificing someone. This shows we all have a dark side because choosing can be really hard.
So, I think everyone has the potential to do good things and bad things. It’s a part of being human. We should try to be better, but it's normal to have some darkness in us, too.