Shouldn't the player journal tell you the reason for a trip to the insurance screen?
Yes it should. A couple nights ago I was sent to the rebuy screen while piloting a ship and still had no clue what happened.
Filled my Asp with Void Opals and headed out of the ring for a jump to another system to sell, and once I was out of gravity lock I went FA off to line up my ship as the jump timer went down, then boosted to get up to speed and boom! Had night vision on, didn't see anything I could have ran into, had full shields, and there were no other ships around me or signs on scanner. Having no clue what happened from the rebuy screen, I looked at logs and just found a line that said hull damage and a line that said died.
When I first got a Python I was running cargo missions and after I docked I stepped away from the game and returned to a rebuy screen. I didn't know about logs then and put in a ticket to find out what happened (must have hit launch instead of enter station, blown up for loitering), and mentioned to them then the rebuy screen should state the damage that killed you.