What the conspiroloons can never manage to explain is why the attack was
allowed to happen, the USA could have put up a heavy CAP, manned all AA guns
and have already flown off a major counterstrike and still would have been
at war as the attack came in, the only difference would have been in the
phrasing of the announcement and the fact that the US military would have
come out of it looking good.

Such an activity would deter Japanese from making the attack.
The goal of FDR (and Churchill) was not to deter attack but lure Japan to
attack US so that the domestic opposition to US participation could be
overcome.
Thats the reason why Washington gradually reduced the information sent to
Honolulu beginning from July 1941.
In other words Washington had a political goal and blindfolded Honolulu to
achieve this goal.

A simple, "this morning at aprox 0600hrs the Japanese navy attacked Pearl
Harbour without warning, this infamous attack was defeated by the courageous
actions of our Army and Navy, the United States is now at war" would have
done nicely.

It could easily be done,but it would not help FDR and Churchill as much as
shock and awe created by Japanese "surprise" attack.
Go to Http://www.ukan.edu/carrie/docs/texts/kimmel.htm
and read the testimony of Capt.Beach.

In Plain English he says basically:
"The goal justifies the methods used to achive the goal"