It isn't at all, modelling is done to predict outcomes because you cannot predict the future, this isn't the weather forecast. There is no model in existence that accurately predicts the next month, it's impossible. We all know the models we'd like to see but the consequences of that being wrong are far more severe.So wrong. The point of modelling is to predict the likely truth. Sure you can do worst case best stuff but it's the likely outcome is what you are interested in. The MPs want to know the likely scenario as they don't want to blow £30+ billion on a lockdown that isn't needed. It also makes a mockery of all the press the SAGE models get.
Let's put it another way, would you rather get your models wrong and everyone ends up fine or would you rather get it wrong but this time lot's of people die because the government took no action?
These models do not exist to make you and I feel better, they're there to model capacity and actions, mild models do not require action but we know that without it existing on a graph.