Why are you horrified by the idea that someone might suffer from their own mistakes, but not by the idea that they might suffer from the mistakes of others?
I'm not sure what you mean by "others" here, but most drugs have side effects. AFAIK, until all of them have been sorted out, using an un-FDA-checked drug could heal your skin OR give, for instance, anaphylactic shock to all, some, or just one single patient.
I understand that if "this was approved in Scotland etc." then it was already tested by some other committee. However, what if Scotland has a different list of drugs, excluding one that's approved in the US and that could lead to serious problems when used together with this spray?