The only real difference is men's lib burdens themselves with a feminist perspective, which does not help, and as this post shows, hurts.
At risk of getting out of context, I (cis male) did not become aware of the systems that were damaging me until I started studying feminism. Whatever a "men's liberation movement" looks like, it is so young and inexperienced that it would be well served to examine and learn from feminist ideologies and perspectives.
Many of the power structures that feminists have identified as being damaging to women in general are also damaging to men in general.
Many of the power structures that favour men in general are damaging to women in general. As we grow and develop, we should be striving to tear down those structures that are harmful to others, rather than further entrench them as if in battle or in a zero sum game.
I'm not aware of any modern feminist ideologies or initiatives that present a danger to men, but if there are any, they should be called out by both feminists and "masculinists" in the same way that both feminists and masculinists should be calling out any masculinist ideologies and initiatives that present a danger to women.
Modern intersectional feminism has grappled with the inclusion of women who have been "othered". We should be trying to learn from that and avoid making the same mistakes.
In the end, we all have to figure out our place in the world, and that cannot be done without considering our relationships to the power structures and each other. At present, that looks like it's necessary to have feminism and masculinism as separate movements, not as enemies, but as collaborators and intersectional movements. Biology, including the fact that sex and gender are spectra with bimodal distributions, may always mean that they remain at least somewhat separate even as shared goals are achieved.
Some of this is going to come across nasty, but it's not, it's an honest exploration of something worthy of deep analysis and discussion.
Who put you in charge? Who puts anyone in charge? Why should anyone get to decide the arc of someone else's life? Why should someone else get to dictate the terms of anyone's life and death?
Whenever I hear someone expressing sentiments like "... with some effort they could live along and fulfilling life", it puts me in mind of all those busybodies who lament or even disapprove of my choosing labour over post-secondary education because I wasn't meeting my potential. No, I was meeting my potential just fine, even excelling. I've had a very fulfilling life, I just wasn't doing what others thought I should be doing. I was not being lazy by not putting in "some effort." I was making choices based on who I wanted to be and how I wanted to live.
What is within us that leads us to demand that others live up to our standards? What is within us that makes it so difficult to see that what is a reasonable effort for one may be an insurmountable obstacle to others?
To get mundane, I find it just about as easy to swim 5k as 2k and 10k isn't much harder, yet I get the impression that most people think of even 2k as beyond their capacity. Would it not be an insult to their very personhood to just call them lazy, the way you imply that this poor soul is just lazy?
We all have different capabilities and capacities. What is within us that insists that we are the standard by which others must be judged?
Some people cannot find the internal resources to continue. What makes the beating of their hearts so important to us that we ignore their own desires? That insist they fight, even after they have no fight left?