When people lose meaning in their lives generally, they will usually take up a cause, as an activist, and use that cause to restore meaning to their lives.
The effect will be for the cause to become more important than almost everything else for that person. So they will tend to act with impunity on things which further that cause.
This is commonly seen among nouveau activists when they undermine a social institution, corporation or similar body of people, in order to further their meaningful cause.
This person, with an important cause, takes the law into their own hands to 'put things straight'. Naturally this sounds justified.
But is it? It is only justified to the extent the cause is inherently justified. And this is by no means certain because the 'new law of this cause' is now being ruled over by the cause itself. So it is circular reasoning leading the cause.
This is why in the US over the past 20 years or so we've seen a shift within most social institutions and corporations, to staff taking matters into their own hands, most dangerously within political and legal institutions and universities.
The primary attraction of these causes is to boost the persons ego - to be seen to be saving the planet. This has more value to the person than wealth and power.
Eventually, the person turns into a perpetrator, ironically of things the cause initially was set up to challenge.
But now the person has become possessed by this cause, they can no longer see that pathology. And sometimes this can proceed for decades. Maybe for the rest of their lives they will be destroying the planets while taking great pride - they think, that the world sees them to be saving it.
Classic examples obviously are climate change doctrine. And supporting Palestine with fierce anger while leaving all the much bigger similar problems completely unattended.
The intensity of the pathology often runs to psychosis, as stated above, where the person is on a daily basis harming the world.