I don't agree with the former, a bell is not rude if you actuate it in advance from far enough. I do that if I see people about to cross my path but looking somewhere else or if there are kids wandering because I know that kids tend to be imprevisible, are often not very aware of their surrounding and have a smaller field of view. If you are just a handful of meters from them, it is just too late to ring a bell, you should have slowed down already anyway.

There is nothing to be done against old people using noise so I just prepare to stop.

Still agree on the second statement.