If some posters think that attitude makes me a vigilante, then we will have to disagree about what vigilantism is.
To be clear, vigilantism is the extralegal meting out of punishment to someone deemed a criminal on arbitrary grounds.
The primary element is punishment
. If I harm a second party to prevent further or imminent harm to a third, that's intervention. If I harm a second party because I think he's a jerk, that's vigilantism.
For the record, I look absolutely ridiculous in Captain America tights. You guys don't want those pictures.