Personally for me, the forums were cool whenever I was 13-14 and I had nothing else to do. Over the past few years, I went from getting along with virtually everyone to clashing personalities which made more enemies and fights then anything. That is when I just stopped, about a April, and told myself it wasn't worth the stress or drama in my life when I had enough going on with drama in the family. I was on variety of forums from dogs to cats to country music. I made a lot of friends though these different forums, some life long friends like Samantha and Steven. Only recently I've been coming back to forums I like and Steven I must say I do like this beautiful forum of yours. You did a wonderful job and put alot of hard work into it. Anyway, I will just state my opinion now...
I believe that forums are only as good as the members and the personality of the forum. In the multiple forums I've been in, I only came out liking two to three. I won't name names of the forums but the two I really liked, had kind members. Of course maybe one or two nasty members but overall the people were friendly, somebody would post get tons of replies and friendly ones too. If someone had been pushed down and had low self-esteem you could talk about it and the members would be there supporting you. While about 3 other forums I was on were terrible and the members clashed with my personality. If I'd post photos of my dog, I'd get rude replies saying he was basically ugly because at the time he had a skin condition. Or opinion I made were shoved down my throat when reality of it was, opinions have no right or wrong answer, no matter how many facts you can shove down ones throat. Most of the reason I stayed on those forums was to talk to Steven, but thankfully he got AIM so I didn't have to get on those forums. While those forums I found unfriendly and hated getting on, others found fun, friendly. So I feel forums are only as good as the members and the majority of the personalities. Always remember, one thing you might take as a joke might be cruel and offensive to somebody else.
Now to answer your question, I do think they can pose trouble for a few vast reasons. Number one being that if you have an issue with your dog, some people are dumb enough to go to a forum and let random people diagnose the dog. If you're having any problems with your dogs health seek vet attention immediately. I have yet to see one person on any forum I am on have a degree in veterinary. Another reason could simply be the attitude people give when answering a question. I've seen posts where somebody would post a question trying to fix a mistake they made but some smart-as, has to crush them down for a simple mistake and makes the person fill 10 times worse then they already did. Instead of trying to help the person with their problem they just yell at them. Third is the amount of bullying I see going on. There is no excuse to treat people, the way i've seen in forums. Some lady joins, she has a designer breed which she rescued from the pound and everyone jumps on her saying how wrong it is to own a designer breed, who cares if its rescued its a designer breed so its no good? Seriously, sometimes it makes me sick to go on forums and see the replies people get. While there are flaws in forums there are also benefits of them. For one would be if you want an opinion from people on a new product or how to train your dog to do something, or break a bad habit. Making new friends with people who share common interests as yours or just simply wanting to show off your pride and joy.
That is my opinion on forums, I am sorry if anything written offends anyone certainly not my intentions.