You could have decided to voluntary wear a seatbelt, and still put no dent in the stats of lethal car-accidents...
ECO terrorism is trying to force others to live how they want them to live. Regardless how convincing your belief, I don't think this is ever a good strategy.
Few decisions are made in a vacuum with no impact to others.
Global warming forces negative outcomes onto people that don't pollute much.
Anything and everything can be framed as an act of force. It is therefore unhelpful to think of things in these terms.
When you don't wear a seatbelt, you risk your own life. When the oceans heat up, and the fish start drowning, then everybody is affected.
Destroying the shared environment is not your personal freedom.
So seatbelts do protect others.