I'm left-handed too. I also sm an engineer, who was taught to block letter write in all of my reports. My cursive writing is horrible (thank God for computers) so block lettering is my normal writing style.
The inconsistencies in the lettering os what makes this person's writing unique.
I'm sure the FBI analysts are coming up with even better profiles, but it doesn't hurt to brain storm on FR. Who knows we might actually stumble on something of value that the FBI could use to catch this terrorist.
The simple strokes of the letters could well imply an "oldster" suffering from arthritis. That would be consistent with the child-like strokes. The fact that FL is the "retirement" state brings the odds more that way. The thing that stumps me is the hyphen between the city and state. Perhaps this person used to live over-seas for a long time?
I DID notice St. Petersburg Times is written smaller and the way it is spaced, I believe it was squeezed in later. The size of the lettering is much too small on that line. If you took it out the rest of the spacing between the lines of "name", "street", and "city,state,zip" are much more even. Look at it. It was squeezed in later, after the rest of the lines were written. Do you see what I mean? That explains the big gap between the street and the city/state/zip. Its as if St. Petersburg was an afterthought as if the person decided "well I better but St. Petersburg times on it just to be sure".
I don't think we should rule out foreigners doing a lot of this work though. Just because a letter is benign doesn't mean there isn't a campaign of terror and fear using benign letters to spread panic, which is obviously working. A concerted effort of either malignant or benign letters would accomplish their goals.
Nothing wrong with a little brainstorming. Yes, FR is definitely monitered by the FEDs/powers that be, though it's probably not as bad as it was in the Clinton years. I'm sure many frustrated agents are beginning to feel pride in their agency again under Bush.