Thought you may like to see how we use our horses at times in the UK. These are the ones we 'desensitise'. Can you imagine trying this out for the first time and riding through it on an inexperienced horse?
Firstly, I only watched the first few minutes so I don't know what else happened.
Secondly, we are not talking about police horses here, but trail horses. Of course I agree that some degree of prior training is required, and the police choose to use desensitizing, which I have never said doesn't work. It is a perfectly effective training method.
Thirdly, I would not take an 'inexperienced horse' in a situation like this, it would be a recipe for disaster. They may not have been in this exact situation before, but I would want my horse to have been in plenty of scary situations before and learnt to trust my judgement when scared.
Fourth, I honestly believe I could take my gelding in a situation like that and still have control. Sure he would be looking around, maybe jogging with the exitement, but that would be about it. The bangs wouldn't be a huge deal as I crack a stockwhip off my horses. The screaming is about the same as he dealt with when he competed in world mounted games here a few years ago.
*Shrugs* Not purposefully desensitizing is not wrong. It is a different way of doing things that also works. None of us (I think!) have said that what you do is wrong, or doesn't work. How can you say that about our method when you obviously don't use it?