There's Criminal in terms of breaking the law and criminal as a type of person - that's the result of traumatic brain injury, abuse in formative years and drugs that remove fear like benzodiazepines, amphetamines and poorly researched use of steroids.
I don't get this leftist/right-wing shit in the context of crime. The vast majority of people fear the deterrents in place to prevent crime even if some fantasize about killing blacks or bankers or whatever they think will achieve something. Have you not noticed how egregious 'political' crimes like mass shootings and bombings are always people blowing their wad on a soft target that achieves nothing?
The finer the granularity in your thinking (this doesn't make you a genius it's simply a mindset) the more you fear the consequences of pain, death, fear itself, loss of livelihood, public disgrace etc if that's what you mean by "leftists" (I'm assuming you mean the lefty/pol/ notion of studious class-warriors not concerned with idpol) as in people who read books and mull over minutiae.
Most of the time can't be sedentary & contemplative and have the urge to carry out egregious actions that mean the end of your life or livelihood. You have to be somewhere inbetween the near-sighted highly mobile consumer worker who doesn't read who would put their job and family before any kind of action and a person who has a lot of time to reflect and sits down all day who is too afraid.
You can't rectify the fear of consequences in the latter with exercise and TRT. You can't do it with any cocktail of drugs. I know how to overcome the fear of any consequence but I'm not going to say it because I believe violence is a waste of time and people always pick the dumbest targets and achieve nothing or the opposite of what they wanted.
If you want to weigh up the effects of someone breaking the law because they believed they were doing the right thing, Snowden's leaks had and will have more effect than if someone detonated a 5kt nuclear device in downtown Manhattan. For whatever reason, a group of people hit the twin towers and the fucking Pentagon on 9/11. It also hit the airline industry very hard. If you wanted to strike the heart of American finance and the MICC you couldn't have hoped for a better result. But everything was just replaced and it was used as a blank check to destroy the middle east, so if you had a tally result, 9/11 was a massive failure, minus a gazillion points if we accept the common notions of what the motive was.
Look at how many bombs the USAF and USN dropped on Vietnam: webapps-cdn-dev.esri.com/CDN/page-templates/products/map-cookbook/vietnam.html
If you count the number of bombs dropped by the US on Vietnam, Cambodia and Laos it is the equivalent to 9 LGM-30 III Minuteman missiles or 100 times the combined tonnage of the bombings of Hiroshima and Nagasaki. This is spread out across a massive area which is actually worse. The civilian deathcounts which are no doubt underplayed do not account for amount of concussion which caused brain damage to those who survived nearby detonations and that is simply physical damage. Add in the defoliant birth defects and alleged deployment of BZ and you have a whole lot of violence.
And now it's as if nothing ever happened. The US and Vietnam are chums.
Breaking OPSEC/NDA laws and risking extrajudicial torture/killing to leak secrets does more damage than any weapon a civilian could get their hands on. The absolute peak of 'terrorism' (really this means committing relatively small-scale violence to create spectacle to invoke a disproportionate response) that can be achieved is a rogue launch of a single submarine-launched ballistic missile which can only release 8 multiple independently-targetable 100kt re-entry vehicles that detach from a bus at the zenith of ballistic arc and spread out across a 150 mile diameter circle which means the devastation of one major metropolitan area and the outskirts. Within a decade people would be making 9/11-esque jokes even if this near-impossible incident took place because it would all be rebuilt. Even if you surgically targeted individuals or small groups, others would take their place.
The most effective action, whistleblowing, is not even a criminal activity. It merely breaks the rules of the criminal underworld.