Richard Hertz wrote:

Control towers are not always the answer.

That's true, but it's one additional person that must make a mistake (or
lose awareness) for something bad to happen. It's not a perfect solution,
but it does improve the odds.

It's a mistake to *depend* upon the tower, though. There's someone with
whom I'll no longer fly because he one refused to shift his approach to
avoid an aircraft because the (class D tower) had "cleared" him for entry
to the downwind. That same person immediately placed all blame upon that
same tower for a midair there a while back.

- Andrew