On the bright side though the world is definitely not full of Sodini's. I think even looking at 1 guy out of 100 or even 200 as being that sort of misogynist is way out of league with reality. Most guys, like most women, try their best to understand reality and that included the opposite sex because quite frankly the less you understand the world around you the far more prone you are to serious grief and misery.
Frankly though, for women not going for seemingly prude or responsible guys - I really think it has absolutely nothing to do with fear of Sodini's walking around everywhere, perhaps some women have had some terrible things happen to them at the hands of a rare breed of self-loathing guy, but I can't imagine that being much more than a rather esoteric minority of women. More often, what I notice with even my female friends and acquaintances, they aren't closed to a guy who's more reserved, just that a guy who's very expressive and uninhibited does a heck of a lot more for them on every level. That said - its perfectly fair in that guys are just as screwed up on looks, I know from my own experience that I cannot be physically attracted to most women I meet, personality being part of that but otherwise looks are an absolute boundary (and the more I like her as a person a) the worse I feel about it and b) the less I want to lead her on). As a guy I can't say that seemingly ferile/uninhibited women don't drive our hormones wild, it seems like for all of us - as humans - its a primal issue, and uninhibitedness in a natural selection sense says that someone's genetically robust enough that people either know to leave them alone or that they've had the privilege of being charming/attractive enough not to get stepped on once in a while is proof of something like genetic royalty. When it seems like someone's had to really wrestle with life to get by, ie. seems too serious, that's when quality control in our DNA steps in and lets us know that they're not healthy.
I think what's at play with guys who are taken, if there's any truth to this study, is that they likely let their guard down because all of a sudden they have no reason to feel nervous around women - they have one (nervousness of course is far more often a subconscious process that isn't easily tuned out sheerly on will). Most women of course have more class than to chase after guys who are taken but, those who would in many cases may in fact do so and its mostly on the attractiveness of the guy's newfound reduction in inhibition or anxiety. Important to note that the guy doesn't have to even be a geek or stuttering mess, even a small amount of anxiety broadcasts everywhere as does the lack thereof.