This is why I can't play Half Life (I don't support this review).
HAHAHAHA
That's so over brown townyzed it's absolutely ridiculous. A child wouldn't even understand those ideas, nor how they're horrifying or graphic, unless your child has read 1984.
Also Half-Life 2 doesn't actually have legitimate gore aside from the zombies, and even then that's laughable.
Consider this: If your mother is afraid of you playing violent video games you must be totally blinded from the news and every day life considering most of normal life is violent.
You could learn more about violence from a car crash than a video game probably.
He's right. Real life is far more violent. In video games you run around killing things in ways that in no way represent real life acts, even CoD is highly unrealistic.
In real life, people are murdered, tortured, stabbed, robbed, raped and their remains hidden under a house.
What
The part of your brain that makes ethical or moral judgement and decisions isn't fully developed until you're 16 or 17. i.e. a child knows not to go into a cookie jar because they will get in trouble, NOT because they think it is WRONG.