1984 - Tilikum is captured
7 YEARS later
1991 - kills trainer who slips into pool (tilikum at this time had never had people in his water before)
9 YEARS later
1999 - Man slips into Tilikums tank and drowns, Tilikum plays with body all night
11 YEARS later
2010 - Dawn dies when she is pulled into the tank by Tilikum
In between ALL of these incidents are YEARS of interaction, with Tilikum by trainers. Every morning, afternoon and evening.
Every animal has good and bad days. Tilikum for how "psychotic" BlackFish claims he is, over all hasn't been in a lot of accidents.
By comparison over the past 11 years Tilikum has killed less people than Mission:Space at Epcot.