K.,
First of all I mean no disrespect, but why would you ask a question like this? OF COURSE any father would choose to take a child to a "FAMILY RESTROOM" if there was one available, that he knew of, but 99% of the time, restrooms such as that are not an option. I've only found them in malls, pools, and gyms actually.
In fact, I've noticed, that any time there is a family restroom, next to the ladies room I still see tons of little boys in the ladies room. Obviously the family restroom is not being overly used at this point. I doubt it was created just with fathers in mind.
Let me ask you this, back to the actual situation stated above, What was this father suppose to do, let her go in the ladies bathroom by herself? How old did she look? If she was over 6, maybe she could have gone by herself to the ladies room, but younger than that, any safe father wouldn't let her go by herself.
Honestly If this bothered you so much, why didn't you offer to take her to the ladies room yourself? You just didn't stand there and whisper about how it wasn't "quite right" did you? If you work with him, he would have trusted you to take her to the restroom more than likely.
TODAY There are lots of single dads out there. This happens as much as a mommy taking a boy to the ladies room. The men's restroom may be nasty and an open waste land of stall-less toilets in your mind, but most actually have stalls just like the women, with locks. YES, they usually do have a couple urinals, but men don't even look at each other in the eye, in restrooms, much less let anything else show. So, the main thing a "young daughter" would be exposed to in a men's restroom is the smell of urine, I would imagine. and yes they have sinks and soap just like the ladies room as well. In fact I've found that most have soap, towels, and toilet paper, even after the women's restroom runs out. ( I have 3 sons)
Let me ask this to the all the moms reading this, Just how many times has your young child asked you, through the stall door "Mommy, why is there a little trash can on the wall in here?" , then more than likely proceeds to open it and look in it, while he is privately finishing up, with that lock stall door that the woman's bathroom exclusively have. :-)
I find that tons more disgusting than simply having a girl see a/an urinal in my opinion.
I am a mom of 5 young children, If my husband has the kids at an event alone, such as a little league baseball game, my youngest daughter has no choice but to go to the men's restroom. I would rather her be with her father in there, than in the women's restroom by herself, wouldn't you?
MOMS There are lots of things in this world, WE as moms should be FREAKING OUT over with regards to our child(ren)'s safety, but this is not one of them.
Thank you for your post... really ...it made my day, I don't mean to offend you, just for you to realize what you actually asked. This father did nothing wrong. He was only thinking -Safety first, with his daughter.