[SkunkPunk]

The "child-like" phrase could be any number of things.
It is very similar to the letters mailed with anthrax.
Maybe the sniper is trying to throw off the FEDs, and actually found the card on the ground at the local 7-11.
Maybe this was his last hit for a while and he figures throwing off "Mr. Policeman" will cover his tracks.
Maybe he really is just a nut-job tarot-card-reading-mo-fo.
If we don't here from him for a while, I believe he is a Jihad terrorist and thought this would confuse everybody...and it looks like it has.

[PFKEY]

Maybe the sniper is...

Maybe this was...

Maybe he really is...

MAYBE

[browardchad]

If we don't here from him for a while, I believe he is a Jihad terrorist and thought this would confuse everybody...and it looks like it has.

Not "hearing from him for awhile" is the determining factor, IMO. If the card is a "plant" (by LE), or something dropped by some fun-loving student while LE was getting their act together on Monday, I would expect it to enrage the killer into striking again. (Someone stole my thunder!)

If the perp fades away, the odds rise that it was intentionally left by him/her -- for whatever reason.