Amnesia Doesn't Scare Me...

[Cranky Old Man]

Shooting people with a firearm, while traumatizing to a degree, isn't as traumatizing as axe-murdering people. Depicted violence also depends on how realistic it is. TF2 is more cartoonish than Condemned, but if you don't feel that something is wrong when killing in close combat in TF2, you should be concerned, because that means that you've grown desensitized to it, and that much more able to kill somebody in real life. In Condemned, the violence is so realistic, that by the time that you've grown completely used to the violence depicted there, you have the mindset of a murderer. If you can joke freely about killing people in Condemned, you can joke whilst killing people in real life.
NPCs are irrelevant only when they are percieved and thought of as irrelevant. While playing, your brain is being programmed as if the situation was real. It is learning a real-life behavior, and it's especially good at it when stress is involved. This happens even if you would be thinking that it's only a game while playing, which you are not.

Sorry but the view you are taking is not realistic. It's called role playing dude. I am completely able to step into different roles for the purposes of entertainment or education for a certain period of time each day. Being in a different mindset for a few of hours (even many hours) a day is not going to have any lasting impact (and it's certainly not been scientifically proven that it will). It takes a lot more than that (say, an existing mental disorder) to lead to complete derealization like that. Is it disturbing to kill someone with an axe? Yes it is, and even raving lunatics have an emotional response to that, but the human mind is extremely powerful and making it not disturbing is what makes role playing possible in the first place. So I might place myself in a chaotic evil role every now and then; doesn't mean I don't stay chaotic neutral with good tendencies when the game in question comes to a conclusion.

You're saying that "even raving lunatics have an emotional response to that"? If psychopaths have this emotional response, then how do you define a psychopath? I'm questioning if you know what a psychopath is.

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Clicking a button to swing an imaginary axe at an imaginary enemy is not even remotely related to actually swinging an axe at a real human being.

Densensitation to at least some degree, has been scientifically observed. While you won't build up coordination for killing people, you can break down all the mental barriers for it, and turn killing into instinct. Would you see a grunt in real life, you wouldn't go "OMG! What is that thing?!". You'd go "OMG! Where's the nearest closet?!" because that's your programmed instinct talking.

Just because you don´t react as some people think you should when you see imaginary blood on a computer screen doesn´t mean that there´s something wrong with you.

"Something wrong" is a very fuzzy border that ranges from phobia of blood, to joking while axe-murdering and executing people in Condemned.

And for the love of God and all that is holy, pewdiepie again? He is just some guy called Felix who live in Gothenburg with his girlfriend making videos where he scream at his computer screen like so many other lets players.

I wasn't the one who ressurrected this topic.

And he has played almost every blo*dy low quality CS on this forum so him being scared is next to impossible.

Yes, I'd expect him to be bored of CSs by now, and I'd expect him to crack jokes to make things interesting while playing those, but it's the other things he does that I'm basing my assumption on.