I have noticed these threads usually fall into two camps. The people who have shiney cars and don't want anybody going near them, and the people who actually have kids and understand how useful the facilities are.
And the third camp, the people who have kids and still are capable of respecting their fellow road users' vehicle by telling their kids not to get out by themselves right after parking. This way kids will learn a good thing and appreciate other peoples property down the line.
I also see MPVs with kids hopping out cracking the door into the post next to it or the car on occasions, parents mosey out shortly after no more aware.