"Andrew Gideon" wrote in message
online.com...
[...]
I'm not sure how you're seeing this. All additional failure modes are
independent of anything that exists w/o the tower. That is, any way that
the tower can fail has no impact on the "see & avoid" technique that would
be present with or without a tower.

A tower failure mode can introduce a situation where a pilot who would
otherwise have been more diligent about "see & avoid" might wind up relaxing
their efforts, resulting in a crash. Mid-airs in Class D airspace very
likely almost always involve at least to some degree this effect.

The failure modes are NOT independent.

Pete