I think that it is a general point, post personal info on the web and it is public, simple as.
I think that there is a danger, a real danger, that people could use living people info in ways you wouldn't think. It's a case of fool me once.... Learn from the mistake I guess is all I can say.
I also think there is an awful lot of rubbish trees, click and add, I admit it I've done it, but public info is exactly that. Why shouldn't I do it? If I want a flight or a holiday, I search and click, I know I miss the joy of going to a travel agents - like I do!
Rubbish trees - garbage info - I think Ancestry is full of it, flooded with it infact. I don't really see anything wrong with that. What's the point of a family tree? I really think we delude ourselves if we believe they are absolutely accurate.
Here's one reason why... I was looking for an ancestor called John Richmond, born in Radcliffe, in 1825 - that's what the census said. I found him (1) In other people's trees, (2) In ancestrys hints. I added him and his mum. Trouble was, when I went to check the baptism registers in the archives there was no record of a John Richmond born in 1825, there was one in 1823, and another a bit too late - what do you do? (I did sort it out by following brothers and sisters). But most people would click and add. Most people would not live close enough to go and view the records. That's just one example of a mistake.
So what is the probability in going back one generation that you make an error? 1 in 10? 1 in 20? I think somewhere near that. So the cumulative effect must mean that distant relatives may well be errors, propogated from earlier ones... we only know it when we stumble across them.
Getting back on the point... What is the point of having a tree? I think that there are probably many reasons. I think that the boom now is obviously due to the ease of tracing ancestors on the Interenet. I think I like telling stories of ancestors who are a bit special, yes I go up a tree and down a tree, but so what? If it makes me feel better, my relatives more proud / intreesting... so what? If someone stole my research, again it's public info anyway, I hope it makes them happy. If someone wrote a book based on my tree I'd be very surprised, I can't see whay anyone would be that interested -- and yes I have several Kings and Queens, Criminals, Sportsman, Politicians and Original Thinkers and so on.... OK it's a bit tenuous (I think they are right though) but hey, isn't this supposed to be fun?
Errrr thems my thoughts.