Echo'ing the general sentiment here:
1. Everything in moderation.
2. Different strokes for different folks.
Prior to my 1st child I also read a lot of the reports on how bad they were - most reports were UK based, and I had a sense of kids taking tumbles down stairs and pulling pots of counters and the like being some of the main issues.
But I was given one when my son was a few months, tried it out, and as Deja said having my hands free to cook dinner or do what ever was brilliant and I breathed a silent "thank you" to the walking ring "gods.".
I am not sure the point was to "assist them with walking" - my point was to entertain my child and allow my hand some freedom.
I do get that a child can get hurt if a parent/care giver does not take sufficient care if securing steps/varying levels/things that can be pulled off tables/edges and so on - however I think that the same care should be taken for a child who is crawling/toddling/walking.
I think the "accidents" might occur as the "change in a child's mobility and height" might be a bit of a shock, and a parent/care giver might not take the required care.
Again, like many things, the focus then is on the "walking ring" and not what the issue is - which is possibly an oversight by the carer.
As time has gone by I have definitely mellowed about these issues that people get "all vexed about" and as Claire says the things that "become a dangerous debate."
Walking rings are fine for me, I get why kids like them, I get why parents like them, and I get the risks, and I get why some mothers/health care workers don't.
However I choose to use them - with the correct precautions and a sense of moderation.