Not sure how one person doing something wrong justifies someone else doing something wrong.
All of the great drivers were (are, will be) in no particular order, pushy, selfish, self obsessed, will push the rules to breaking point, will intimidate opponents & ultimately will (like most people) attempt to justify their behaviour simply because it aligns with their own self interest.
Think of the recent "nice bloke" F1 drivers: Zanardi, Berger, Patrese, De Angelis, Johnny Herbert, David Coulthard... Not a champion amongst them. Although Zanardi is a champion for many, many other reasons.
If you think back through all the champions for the last 50 or so years how many would you classify as nice blokes?
None of this justifies parking your car on the circuit to stop others out qualifying you anymore than it does running into other people. Although I would say that Senna's actions were much less cold & calculated than Schumachers. Or are we talking about Schumacher running into Hill and/or Villeneuve?
From memory the Senns/Prost thing (the mk 2 version, ie the one that was Senna's fault, not Prosts) was with Senna in a McLaren & Prost in a Ferrari. But I could be mistaken.