I agree with you, OP. Almost everybody on MN will have a partner and/or family members of the opposite sex whom they love and greatly care for - but so many people seem to want to make it a 'them and us' battle.
Yes, women are socially, physically and biologically disadvantaged against men as a class in many ways, and there's a creeping and concerning trend towards taking women's safe spaces away, which we should all be campaigning about. But even then, there will be comments clearly suggesting that men as a whole are desperate to get into women's toilets and changing rooms, when in reality, the vast majority have no interest or desire whatsoever to attempt to do so. You can put measures firmly in place to protect you from all potential doers of harm, without assuming that all of those potential people are probably guilty of it anyway.
Worldwide, a very high proportion of financial internet scams originate from Nigeria. Does this mean that Nigerians as a class are all thieves and robbers?
London has a lot of pick-pockets and distraction-thieves of Romanian descent. Does this mean that Romanians as a class are inherently criminals?
The 'NAMALT' term is thrown around frequently as a lazy way to belittle those who dare to suggest that we consider people as individuals instead of lumping them together as one great big stereotype.
Conversely, it also goes a long way towards absolving said individuals of any personal responsibility for their unacceptable behaviour and, by extension, can serve to attach blame to their victims if we just brush it off as normal: "Well it's a lion - of course it's going to rip your arm off and eat you if you go into its cage" ; "Well he's a man - of course he's going to attack and abuse you if you don't ensure you stay out of his way."