I really find the original comment very strange, and quite shocking that it's currently the top comment. In particular the way it singles out "mostly mothers" as being "bad parents".

Parenting is very hard, if these mothers are the sole/primary care-givers they are doing an extremely difficult job.

For those who haven't experienced this, the difficulty in my view is not dealing with an isolated situation. It's dealing with these situations every day, over an extended period of time. It's hard work, and it's hard to get everything right.