Because normies don't get it.
There's a picture somewhere in my massive folder that I can't find anymore, but it is a screencap of Twitter normies reacting to Wizardchan. Not even "misogynist" posts, just wizards being depressed about being lonely and jobless. Their response was, with me slightly paraphrasing:
>You should just lower your unrealistic expectations, develop an interesting personality and maybe then you'll find a woman.
They simply do not comprehend that some people have a hard time socializing. In the same light, they are unable to comprehend why someone would want to forego socializing as a whole. In their eyes, they are wonderful human beings, and so are their friends. Since that is the extent of society that they're familiar with, they can not comprehend why someone would see society as anything less than perfection.
Any arguments that hikkis, virgins or even just socially awkward people may have are inconceivable to them. In their eyes, society, and the world as a whole, is a childishly pure wonderland where everyone is nice, caring, trustworthy and betrayal is just as rare as winning the lottery.
Even if they were to be betrayed, cheated on, dumped or so, they'd turn to one of their other dozens of friends to feel good, and as such, they don't have time to even consider that society is not ideal.
To a normie, paranoia is unfounded, mistrust is irrational, reclusion is just silly and, in this case, agoraphobia is just something you get over with a little effort.