"She won't let me see my kids!!' Is actually 'she won't let me see my kids at a moments notice/because I'm aggressive/because they are scared of me/because I don't turn up/because I turn up drunk/because I don't supervsise them properly/because I can't in any way put myself out/because they come home exhausted and filthy/because I send them to school looking so neglected their mother is embarrassed (me)/because I have a drug problem....and so on".
^This. I do know that some women can be unfair with contact arrangements, but I'd say in the vast majority of cases (in my experience), there are genuine good reasons when a parent withholds contact.
"I hate when RPs complain how hard it is to be RP but would never let their ex be RP."
My ex sees ds regularly, they love each other. I suppose I could get ex to agree to be full time rp, and do a runner and fuck of to another country or whatever. But ds wouldn't have his hands or face washed in the morning, nails cleaned or teeth brushed. He wouldn't get breakfast, wouldn't get notes and cash returned to school on time. Nothing for break. 5 minutes spent on homework, that either his dad would do for him to save time and hassle, or that wouldn't be checked if he did it himself. Reading book or spellings wouldn't be done. He'd get dinner but probably not every night. Would sit glued to his ps4 or the telly from hometime until his dad remembered to put him to bed, way too late for a school night. His shoes and clothes wouldn't fit right, any illness would be "an exaggeration" and he'd never go to the gp, dentist or have his prescription checked. Ex would spend the bare minimum of any benefits on ds. And there's a good chance he'd leave him home alone to go out drinking. Plus his moods from being chronically hungover/basically being a functioning alcoholic. Honestly I think in the end his mum would end up reporting him/ fighting him for custody herself.
But no you're right, how off awful of me to complain about having to do all of the practical/boring stuff alone, when my ex would be perfectly happy to 
When we split I gave him a list of things to be in charge off, and he did fuck all. Forgot to pay money to the school, then lied that he'd sorted it (glad I checked now or ds would have went without). Now, he comes to my house to spend time with ds, so I can supervise, after realising how little actual parenting he was doing during overnight stays (had thought without me to rely on he'd step up but nope).