No, it would have added clarity because it would show that the kid on the right is prevented from going to the left side, which is a necessary assumption for the given metaphor to work.
However, that would make it obvious what the real problem and the solution is. Which would be detrimental to the political message the comic is trying to push, because then instead of giving assistance (putting up boards to move the tree), the obvious solution would be removing something (the literal and metaphorical barrier). The author clearly intended to show that providing assistance is justice, not removing barriers.
It’s a disingenuous comic, because equity and “justice”, while appearing differently in the comic, in practice would be exactly the same thing.
Besides, anyone portraying their position as “justice” is a massive red flag.