What is "Safety Car Line One"??

So Monaco was the usual combination of a grand event, but dull race. To be fair the narrow confines of Monte Carlo don't exactly lend themselves to great overtaking opportunities, but Moncao, even to someone who isn't the greatest F1 fan, is still a great "event".

Unusually for F1 the race finished, and I am choosing my words carefully here, under safety car conditions, OK maybe not so carefully...

Logic, and standard racing rules from Karting up and across to NASCAR, would suggest that on a restart the start / finish line is the point at which the race restarts. Firstly this is due to the line being a fixed point which everybody can see and relate to and secondly it is where the green flag or light is located to signal the restart. It is not hard to understand that one lap ends under "yellow" while another starts under "green". I could understand if a line on the track was designated a "restart line" as in NASCAR, where the drivers can accelerate from the line but must stay single file until they cross the start / finish line. To me this is all fairly easy, and again is a standard procedure from the lowest levels of racing upwards... unless you are the FIA and F1...

So its the last lap at Monaco and as per the regs the safety car comes into the pit lane to enable the cars to  cross the finish line on their own. Trouble is race control put "Safety Car in this lap" and "Track Clear" on the timing screens, while the marshals posted after "Safety Car Line One" had green lights and flags displayed.

Confused yet??

On this basis most of the teams told their drivers to race to the line and Schumacher gained a position. Had the drivers not been on the last lap Schumachers actions would have been legal, which on its own is beyond belief, but it was the last lap... 

F1 regs say, "If the race ends whilst the safety car is deployed it will enter the pit lane at the end of the last lap and the cars will take the chequered flag as normal without overtaking" and Schumacher is given a 20 second penalty in-lieu of a drive through.

Questions...

• Why do the F1 powers that be make life so complicated for no apparent reason? - if it's not broken...
• Why introduce a different line from which the drivers can race and overtake from when the start / finish line is already there and is a pretty clear cut procedure to me? - if it's not broken don't...
• Why bring the safety car in on the last lap but still have the race finish under safety car conditions, with no safety car? - just keep the safety car out and everybody would understand exactly was going on... - if it's not broken don't fix... 
• I understand it was the first time this scenario had occurred but why didn't race control have a clear set of procedures in place and ensure that all teams are aware of the procedure? - it wasn't broken don't fix it...
• Is there a "Safety Car Line Two"??
• What is "Safety Car Line One"??