Seems like no matter how positive the headline about the technology is, there is invariably someone in the comments pointing out a worst case hypothetical. Is there a name for this phenomenon?
Not believing everything you read on the internet? Being jaded from constant fluff and lies? Not having gell-mann amnesia?
I get your sentiment of "why you gotta bring down this good thing" but the answer to your actual question is battle scars from the constant barrage of hostile lies and whitewashing we are subject to. It's kind of absurd (and mildly irresponsible) to think "THIS time will be the time things only go well and nobody uses the new thing for something I don't want".