There’s no evidence that they are acting out fantasies of violent, degrading sex with real women. None at all. You have no idea what these men were thinking, what their fantasies are.
Well, neither do you. Perhaps you are right, that the majority of men who purchase sex dolls wish to have loving respectful sex with them - the loving respectful sex they can’t have with a human woman (and of course they are very unlikely to hold any resentment about that fact). However, I believe there have been some observational programmes on this (a poster references one on the first page) which have shown that at conventions for these dolls a large proportion of men, when allowed access to them, engage in extremely violent sexual behaviour towards them.
Also, another poster shared a link upthread where an academic who has studied the history of sex toys commented that it isn’t a coincidence that these sex dolls were developed around the same time that women were liberated sexually - and could therefore say no. There was therefore increasing demand for women who wouldn’t, or couldn’t, say no.
So I don’t think it’s fair to say it’s paranoid speculation.
As for the realism point - no, they aren’t especially realistic. But they’re supposed to be, and they’re getting ever more realistic - that’s the point of the breathing. And if we take your ‘it’s not real so it’s fine’ argument to its logical conclusion, then anything is ok provided it’s not real, isn’t it? These doll manufacturers can make child sex dolls - it’s fine, don’t be so hysterical, it’s not real! Except, wait, it’s (rightly) illegal....