If someone asked me why I was fat, I would tell them... well, when I fell pregnant I was a couple of stone overweight (drinking a lot, takeaways, not active), then I gained five stone with my first (yes, five stone in eight months), then two stone with my second, I ate badly during my first pregnancy (I felt sick all the time, and lived on processed stuff as cooking was a vom-fest), and a combination of this and being unable to walk during either of them lead to massive gain.
I've found it tough losing the weight, my (mental and physical) health has been crap since I had kids, but here I am at six stone and four pounds off, slow but steady, it goes on faster than it comes off. My body shape is completely different, so even at a weight where before I'd have been comfortable in a size 14, I am just into size 16s.
Don't hate me because I say being pregnant and having kids are why I'm a fattie. It's true. It's not my excuse because I am doing something about it, but it's blooming hard work getting time to focus on yourself when you have two children five and under. I think you need to be more understanding.
Of course there are people who are deluding themselves, blaming the pregnancies and eating like crap still. I'd maybe feel a mild irritation at most, on a bad day, just before my period, after a sleepless night. Maybe.