@Huma0 In my experience, yes, people who let their kids run wild and damage stuff, walk around with food and smear their jammy hands all over the walls, themselves have households which are a mess with damaged stuff. Oh, they might yell at the kid for playing with daddy's powersander and breaking it, but by and large they think having kids means you can't have a nice house with nice things.
I have a dear friend who had 2 daughters a year and a half apart. She also had a chronic illness and was mostly in pain, so she was just overwhelmed. I remember going to her house once and found the front door wide open, with no one home. I had to make a phone call, and as we were the sort of close friends who did that sort of thing, I just walked in and went to use the kitchen desk phone. I picked up the receiver to find it entirely smeared with butter. There were toys and clothes scattered throughout every room, piles of dirty dishes, food on the furniture, etc. etc. You could never find any cutlery in her drawers because she let the kids take it all out in the backyard to play with in the sandbox. Her oldest daughter discovered a bunch of it when she was 20 years old, and had decided to dig up that old sandbox area to make a nice flower garden for her mom.
Then at one point a few years later, she called me up to say "I finally got it! I realized that I keep house like a 10 year old. To me, cleaning the house means scooping up the kid's clothes and toys and throwing it all in their room, rearranging the furniture, and vacuuming the visible parts of the room. I'm turning over a new leaf and I'm going to start cleaning like a adult and not let the kids just do whatever they want anymore."
And she did. But many parents never do.
And as you say, childless guests are also quite capable of absolving themselves of responsibility- it really has to do with mostly with character and upbringing, rather than that the damage was caused by their child.
Although there is a type of person who will defend anything their child or their pet does, whereas if they themselves broke something, they might offer recompense. If Fido scratches the doors, it'll won't be "Oh, I'm so sorry. That will obviously need sanding down and refinishing and of course I'll pay for that", but "Well, he doesn't do that at home, but he always gets a bit stressed out in a new place", end of story.