This is pretty entertaining. But the super edgelord comments might have it beat. "If only the author was an awesome warrior like me he could write this properly." We've no idea how common VR technology is nor how expensive it is to access. The MC comments that its weird anyone was working on it while the war was going on so it looks like it could be an abandoned technology. The MC is clearly not affluent and has been busy working to support his remaining family so its not unreasonable to assume he has no experience with it.
He also wasn't particularly good at the job he was fired from, hence the firing (he also admits this). The job where he wasnt trained to be a "professional killer", and by the looks of it was entirely self trained. In the scenario pointed out he lost his temper. Shockingly people make stupid decisions while angry. Yes, yes, I know our cold blooded totally logical commenters would never make those kind of mistakes and would have effortlessly killed the guy using their diabolical techniques. But sadly fictional manga protagonists are more human than our elite commenters and thus suffer human frailty.
