I wonder in what way does “…the hope of regaining his former life…” influence the story?
Also not sure the reason for the inmate’s drug abuse (“…past abuse as a subject in a 15 year drug trial.”) should be in the logline. As long as he is a drug addicted or troubled inmate that needs help the MC will need to help him.

I don’t think this should be in the logline, if this is his motivation to pursue what it is he is pursuing, could you specify an event that happened to him that created this motivation? If so perhaps it would be better to write that into the logline instead of describing his motives.

The MC sounds very interesting the clearly contradicting characteristics, job and environment add layers to him and make his arc easily understood and rather significant.

The story feels disjointed to me because the action the MC will take is seemingly not dramatically connected to the events that start it off and the end goal is vague.

I know you have already written the script but just to demonstrate this is kind of what I meant with regards to dramatic connections between the actions and events:
After losing custody over his children because of his own drug addiction a prison councilor must keep his job by helping an inmate in trouble if he is to gain back visitation rights with his children.

Perhaps you could pick out similar plot points from your script to achieve the same cause and effect relationship in the logline.

Hope this helps.

When you pin losing the bonus up against fighting killers in a post apocalypse world the two don’t match each other.

What I mean is if he is going out to kill people why would he care about making a little bit more money from a bonus? As previously mentioned the world has ended as we know it and civilization has broken down. Salaries and bonuses are now meaningless it’s resources alone which will determine life and death. If the main action of the MC will be determining who lives and dies the event that sets him off on that action needs to be compelling enough to do so in a world that life and death are so easily exchanged.

That’s probably why in Mad Max the MC’s family are killed to set him off on killing the gang that did it.

The MC description also seams cumbersome “cattle drover” better one word farmer. More so in stories such as this best to specify a single antagonist rather than a generic war criminals. This way the obligatory end scene when he defeats the bad guy or gal is alluded to and the main action the MC will take for most of the film is clearer.

Hope this helps.