I don’t think it’s realistic to assume you understand the mental state of someone who’s already proved they are capable of setting themselves on fire to make a point.
They were suicidal
I’ve not heard any reporting say this. I’ve seen internet commenters presume this, but just because someone engaged in an action that could result in their death, doesn’t mean they’re suicidal.
Starting ones self on fire is a suicide attempt, regardless of political motive. This isn’t the same as sky diving or even trying to see the Titanic in a carbon fiber pod, this is pure and simple, self immolation to death that failed, so far.