MGTOW is for men what feminism is for women. Now they both have an alternative to following God's law in their own lives.
You are toeing the feminist line with this type of thinking. "Some women are wrong, therefore some men are wrong too." BAD THINKING! If you can't just admit that feminism is wrong, without also blaming men somehow, you are infected with feminist ideals (which most women are and don't know it).
Feminism = the false ideal that men are 'out to get them' and subverts the natural order of society and women's natural instincts, therefore to knowingly hold such views is immoral and uncatholic.
MGTOW (I'm definitely not an expert on what they believe, but as guys are simple, therefore their philosophies are pretty easy to figure out too, especially for a male) = a social response to the growing feminism philosophy which permeates not only dating but family life, the legal and educational system, career opportunities, and even most plots of movies (sadly).
The gist of their philosophy is: "Women are acting crazy and i'm not going to deal with it anymore. Life has more to offer and I'm going to discover it, and do it my way, not how 'society' tells me too." I don't get the feeling they are overtly hateful of women, but more apathetic and having a loss of interest in dealing with the "baggage" that most women bring to a relationship, not due to any bad decisions they've made (i.e. divorce or single motherhood) but simply due to their false and overly-idealistic (Disney/hollywood-inspired) expectations for marriage, family and life in general. No one can live up to those expectations and once women realize that marriage is hard work, they either become bitter and complain or they divorce and look for someone new. And they always blame men, for not giving them a "happy life". News flash, dear: Happiness comes from within. You're not happy because you're overly selfish (which is totally contrary to women's natural instinct to help, nurture and sacrifice).
Add to these issues, the consumerism that is rampant globally, the selfishness of the age, the impatience of our modern world, the lack of a true religious and spiritual outlook on life (which applies to men and women) and you have all the reasons in the world to understand why *some* men are not interested in marriage. The risks outweigh the benefits. They'd rather be single and happy than married and miserable.
There's nothing immoral about staying single. I don't see how the MGTOW philosophies, aside from those that propose cohabitation/fornication, are immoral. For some (those in their 20s), this may help them to grow up, do their own thing and 'find themselves' (in a good way). The millenial age is FILLED with the message that "if you're not dating anyone, you're a loser." Anything that will keep them from listening to society's message is a good thing. If they follow their natural inclinations, more than likely they'll mature far quicker than the effeminate and metro-sɛҳuąƖ men that society says are the norm. Then, they'll probably get married. For those in their 30s-40s who are following MGTOW, it's probably because they've been burned/divorced and are skittish about going through such craziness again. Can't blame them.