You CANNOT excuse Senna's behaviour at Suzuka in 1990, no matter what. Turning in early at the chicane is at an absurdly slow speed. Spearing across the track at Turn One at Suzuka is ludicrously dangerous, especially in 1990 cars.
Gracious me, Piquet Jr. (Singapore 08), Grosjean (Spa 2012) and Schumacher (twice) were crucified for doing much lesser versions of elements of what Senna pulled on that instance.