It's just that his parent don't trust what I say. I want a few tech savvy guys to say what they think.

As you said, it's not any more dangerous than running a Web browser. The thing is: his father is convinced that playing a PC game is much more dangerous though he has no problem with games that plays in a web browser. I just want a bunch of people to support me saying playing a PC game is not more dangerous than running a Web browser.