Sorry, long post, but I'm a bit emotional today. Just to echo some of what previous posters have said here: there are infinite ways in which infertility in all its forms can be horrendous.
When I was TTC for years without a positive test, I used to think 'if I could even just have a miscarriage, that would be something - I'd at least know we could get sperm to egg.' Then I had a miscarriage, and that felt absolutely shite in a whole new way, and it didn't feel like any sort of progress. I remember thinking, 'I'd just like to have had the experience of a full-term pregnancy - I'd just like to know what it is that everyone's always talking about, that unique experience of what a woman's body is apparently built to do'.
And then I had a full-term pregnancy that ended in stillbirth, which felt absolutely shite in yet another new way. On balance, I'd have rather lost my daughter at 8 or 9 weeks than gone through a whole pregnancy only to have her die and have to bury her. An early miscarriage would have been 'easier'.
But then after the stillbirth there were several more miscarriages at 8-9 weeks, which were also awful, and didn't feel like a 'better' experience than a full-term stillbirth - miscarriage upon miscarriage after stillbirth was clearly the worst experience ever.
The fact is that at each stage along the way I was having something that I, at a previous point in my life, had longed for. The excitement of a positive test. All the self-satisfied moaning about the discomforts of pregnancy. The people cooing over my bump and being excited for me and buying me things. My friends who already had children excitedly welcoming me into 'the club', inviting me around again for the first time, following years when we didn't have much to talk about. Having something happen, even if that something is repeated, heartbreaking loss, is a different kind of awful from having nothing happen for years and years.
Not having any children isn't just an accumulation of all your failed attempts and losses, it has massive implications for your social life and your role in your wider family and how people respond to you.
I have no doubt that secondary infertility is a differently nuanced kind of awful I won't be able to understand because I haven't experienced it. But that doesn't mean I don't remember the kinds of awful that I've experienced before, or that they're not valid, or that they weren't actually awful, or I didn't know real awful.
I don't think anyone on this board thinks women with children are evil or selfish; I think what pretty much everyone can agree on is that this is hard and that even if your success doesn't feel like success to you - even if your child or children, however much you love them, complicate your experience of fertility difficulties and contribute to a different sense of loss - that doesn't mean other people are immature or wrong to feel the rage and despair and anger that this whole process brings.