If they've referenced those things, it's because those are the REASONS the moms are choosing to stay at home!! You shouldn't feel "slammed" if you don't agree ... just live your life and don't worry about what other people think. Why does it matter to you?
Now, doubtless I will be FLAMED again (as I have been multiple times in the past on this board) for my opinion, but I'm going to share it because the OP asked WHY those of us feeling the pinch "don't just get a job."
I have been a daycare worker, a stay-at-home mom, and have worked both part-time and full-time as a mom so I feel I am uniquely qualified to weigh in on the topic. I saw what the little ones left in daycare for 10 hours a day went through missing their parents. I had parents bring obviously sick kids into school, only to have them throw up a few minutes later and then proceed to get everyone else in the center sick, just so the parent wouldn't have to miss work (uh -- they had to miss ANYWAY when we called them to come pick up their child!). I was there when babies took their first steps or said their first words -- things their parents missed. I could see how sad some of the moms were when they heard us tell them about these milestones.
After I got married and became a mom, I had another job in daycare, only in the corporate office of a multi-state chain. I was the assistant to the president. I worked part-time, and he offered me free daycare if I'd go full-time. I said no way, and left so he could hire someone full-time. I've had other jobs since then, but have always had a family member (or my dh if he was home) watch our son.
That is why I PERSONALLY chose not to work and put my son in daycare. I'm sorry if it offends anyone, but that's the way it is. My choice. Maybe not yours, but MINE.
Now, I am again a SAHM. My dh was laid off last year from his full-time job. He has only had part-time and temporary full-time jobs since then. I have worked two full-time temporary jobs since then, but one was from home, and the other I could bring my ds to. I homeschool our son, and while we have carefully weighed the idea of my returning to work and putting our son back in public school, we believe that that is NOT what God wants us to do at this time.
Also, studies have shown that it's even more important for pre-teens and teens to have the guidance and supervision of at least one parent than it is for little ones! If I was working, he'd been left to his own devices after school each day ... that's when kids get into the most trouble.
My dh loves having me home to accommodate his schedule (he literally works all hours of the day and night and never knows when he will be called out on a job), plus, realistically, there's no way I could get a job with any kind of set schedule. Also, he makes a lot more at his various jobs than I would at even a full-time gig.
So, OP, THAT'S why I don't just "get a job". We're definitely pinched, but we're doing okay, not paycheck to paycheck, and this is my only child. My life isn't centered around him, but I do feel it's my responsibility to be here for him 'til he's grown (I'll only be 42 when he's 18). God willing, there'll be plenty of time for me to work then.