little really, but the RPG they perceived did have to be taken as a threat. as much as I really did hate having to type that.
The firing on the van does seem to be unnecessary, as it was clear that the persons in the van were there to render aid to the wounded, not to aggress.

I also note that there are errors in the captioning of that video, for example during the first few seconds of gun-camera footage a voice is heard to say "Afferm." a shortened version of Affirmative. Which in context would mean "I understand". The captioning states instead "Stay firm".

Blatantly unnecessary attacks by the gunship were included in that footage. However the initial decision to attack, based on the perception by the gunship crew that the group on the ground did have weaponry that could threaten the unit in question, I cannot disapprove of.
I do find the gunship crew's attitude distasteful, but that cannot be a valid reason for condemnation of their actions. Unfortunately perhaps.

Not the sole reason. Part of the reason of the French and English inaction, was basically that they were only just coming to realise just how badly they had screwed up. They had been pressuring Germany for years to pay ever higher and more ludicrous reparations for the previous war ( WWI). They did have data showing that Germany couldn't hope to pay the reparations demanded in anything like the deadline time, but they had convinced themselves that ( due to the German government's policy of forcing employment rates artificiality high), it was a ploy to get out of paying anything. As part of this pressure, the French army had made several incursions into German territory, holding some of the more valuable industrial zones as 'collateral'. This, combined with the removal of a significant chunk of German territory into polish hands, made it nearly inevitable that Germany would try a military expansion in order to acquire territory, particularly production centres in order to stave off bankruptcy. When Germany began pushing into polish territory, ( initially to regain control over land that was considered essential for food production), it marked a large change in how Germany's foreign affairs were interpreted. Previously England and France assumed Germany to be beaten, and unwilling to return to force of arms, a position that had been reinforced by German diplomatic efforts to convince the two nations of just how desperate the German economic situation was becoming.