Thanks for that. Other sibling posts to yours all seem to be taking the position that "the end justifies the means". That's not what's in effect here at all. In this case there's no such corruption, it's purely engaging in a moral action in defense of those being acted upon immorally.
This is not an example of utilitarian ethics, with the greatest good for the greatest number, or diverting a runaway streetcar to avoid five people on the tracks, at the cost of striking a single person on the other track.
Also, the OP of the reddit article is not a US citizen or resident. Not entirely sure if his actions ARE illegal in his jurisdiction, wherever it is.
Edit: In fact one poster on the reddit post pointed out specifically that in France it would be expressly legal.