So basically you are saying the/some models were biased towards a certain goal, well as they are written by humans they are bound to be biased really as its only, in the end, someones views. Likewise the new model is also biased to accommodate those goals. As they say in all computer programmes though rubbish in, rubbish out or in my language bollocks in and bollocks out lol. But in the end whatever actions are or not taken it isn't the computer that has the final say but man so they can ignore all models and just implement whatever policy the current government subscribes to. Which obviously can be right or wrong.
Your second point about relaxation of the original measures as deaths reduce is a valid one but perhaps many want to err on the side of playing safe, who the hell knows what goes in politicians minds, just as bad as trying to understand women, either of them are just bloody illogical