"At the very best, they [old people | horse riders | children | motorcyclists | other drivers] are a hinderance because cautious people have to completely avoid

"At the very best, they [old people | horse riders | children | motorcyclists | other drivers] are a hinderance because cautious people have to completely avoid a lane where one $X is driving on the edge of, thus slowing down the entire car traffic. $X are dangerous and they don't know what they are doing, they are a danger to themselves and others." So where do we go with this line of thought? As you can see, it's not helpful in any material way. We need to make the roads safer for everyone, including other drivers. And not vilify a small (but increasing) and vulnerable portion of road users because of anecdotes. BTW, I'm a motorist, cyclist, horse rider, old person, ex-child. So I might be biased.