I think it is rude to delete people's comments, exceptions being: The person finds the comments rude or offensive.
I've left a few comments up which I found in the 'grey zone.' I think it is better to leave everything 'as is.'
A little off-topic, but since political opinions on FB have been brought up: I feel sad about this, and I preface this by saying I avoid politics almost completely on FB, with the exception of when Obama won in '08, I posted a 'Yay, happy" short message....Anyway, on my FB I have a *wide* mix of people from rabid Tea Partiers to rabid Liberals to gay activists to anti-abortion folks, you get the picture, so the last thing I want to do is post political stuff and have discord on my pages...so...
I had a FB Friend, a very favorite person, someone in my family I never met in person.
This person did genealogy, was friendly, active, someone who was a great person to have on my FB, in addition had loads of vintage pictures shared of my ancestors even more than 100 years back.
She e-mailed me and told me she disabled her FB account. She had posted some political opinions and now she is on the opposing group's 'hate list' that is outside of FB. Her personal information including e-mail address is posted on-line. I was able to find that site easily on a Google search.
This is creepy and wrong, and I miss my FB Friend, too.