Why use HF spectrum when there is so much other,
more suitable and much wider, spectrum available
way up the bands

"Fractenna"
Because the extant infrastructure is overly lossy at
higher frequencies.

I didn't say to use the power lines.

They could implement a low power system using the empty TV channels in each
location. Tons of bandwidth with no significant interference to anyone.

BPL is a stupid idea. It is probably a bad investment because it will likely
get eventually pulled off the market.

Do you have any logical rebuttal to the bit about the BPL leaking out and
ruining the HF spectrum (especially for SWLs, even more than Hams)?
-ANSWER THIS.

That is why BPL is supported by both Presidential candidates.
One of the few points both these gentlemen agree on.:-)

Only one is (apparently) a gentleman.

Hint - the one without the receiver taped to his back during the first
debate. Religion with morals is, well, that's Dubya.