I found the short engaging and innovative in portraying the similarities between the two shootings, however, it fell far short in conveying the differences.
The trailer culminates on the issue of gun ownership. In the film, however, it is covered in a very isolated way: a 2 minute segment on the opinion of the priest in Dunblane and the introduction of tighter gun laws in the UK (already far stricter than the US) and then the text at the end of the film which compares changes to gun laws in the UK and US.
Rather than the issue only being presented to the viewer, there should have been dialogue between the priests and the communities about the issues. The reason a school shooting hasn't happened in the UK since Dunblane is not because of the support and hope in the community (valuable as this is), it was because of the action taken and a wholly different mindset on gun ownership. For me it was a missed opportunity.