You are right - they're lethal!!!
They don't teach babies to walk despite being called a walker, and personally I think they put un-necessary strain on growing ankles and joints.
Plus they tip over once the little ones get fast enough!!
Of course you're right. Kids don't need baby-walkers to walk, they've been learning to do it for thousands of years without them. Plus, about five years or so ago, they were the biggest cause of accidents for under 1 year olds being admitted to hospitals. (I don't think they are any more because people stopped using them in the wake of that story - not sure though.)