Let's say that a shepherd village has wolves running around. Wolves are really bad for a shepherd village, because they'll eat sheep and the village will be devastated by a loss of livelihood.
Let's also say that one kid who was watching the village sheep decides that he's bored and wants to pretend that he's seen a wolf. He'll rile up the townsfolk and they'll get weapons ready, but there's no actual wolves. The people of the village are not going to like being tricked, and their response of how bad wolves are will be notably diminished when they discover how easy it is to fake a wolf attack.
While the reflexive response of someone who's seen a wolf is going to be to throw everything at the problem to stop it, the reflexive response of someone who hasn't seen a wolf but has seen people falsely crying wolf is to disbelieve anyone who cries wolf.
Such is the problem that forms. We all rightly claim that one rape is too many, but not everyone claims that one false cry of rape is too many.
But the problem is, look what happens. We don't get to dedicate all our resources to stamping out wolves because we have people crying wolf, and we have to go into the deep effort of determining what really happened.
That's why it's so important, when wolves are bad, to go after the people who falsely cry wolf.
From what I've seen here, people agree that there are many problems that women have which should be addressed, and "manslamming" is not one of them. This is likewise akin to crying wolf, because people will wonder whether this is truly the extent of problems that women face if it's what they're hearing about. When that one gets disproven, it damages the feminist movement as a whole.
Every false cry of wolf makes it harder for anyone to deal with actual wolves.
I will say that as far as television, I would be quite pleased if everyone stopped watching Lifetime because they got sick of its portrayal of women and it went off the air.
Also, as a biological male, I'd much rather be actually raped than be accused of rape, and I'm still a virgin and it holds religious meaning for me. I can much more easily deal with the emotional trauma than with the stigma of being thought a rapist and all the legal crap that comes from it.