[inferiorhuman]

  Surely Ted believed what he was doing was a great good

Hardly.

https://www.bbc.com/news/world-us-canada-65867291

  In his own journals he wrote that he didn't claim to be "altruist or to
  be acting for the 'good' (whatever that is) of the human race", instead
  insisting that he acted "merely from a desire for revenge".

[11235813213455]

When you target a plane, it's quite symbolic for the pollution and destruction of the environment