This just makes me more sure I am right in the way I see this subject.
There's really no right or wrong here, it's just personal preference.
Personally I'm not into casual sex - or, more accurately, I'm not into deliberately seeking out casual sex, will come back to this point in a second - the few times I've tried it I really did not feel good about myself afterwards. But I wouldn't rule out the idea that I could have a good experience in the future, perhaps I've just been unlucky. However I am naturally a fairly reclusive and asocial personality type, and therefore the effort involved in putting myself in situations where casual sex is likely to be the outcome often seems great enough that I don't have much interest in bothering.
That said, I recognise that for people who are naturally more social and outgoing, the effort/reward ratio from seeking out casual sex is great enough that the effort invested doesn't even seem like an effort, probably it even seems fun and exciting.
Most of the time, to me, it doesn't, and obviously it doesn't to you either, but I would venture to say that is likely to be a healthier choice for most people to have casual sex sometimes, or at least vaguely
try sometimes, ie, put yourself in a situation where casual sex might be the outcome, even if it isn't the primary objective - rather than just telling yourself everyone could be a serial killer and it's easier to stay home and watch porn.
Honestly, I think almost everyone who claims to be just not interested in casual sex can imagine a scenario in which they would be very interested in having sex with someone they barely know, even if that scenario is extremely unlikely to actually happen in reality. More likely they're just not interested in putting in the effort to seek it out because of a perception that the risk/reward ratio is not favourable (whether that risk is the risk of getting murdered, or just made to feel emotionally uncomfortable in some way).