Pure common sense. The age of the dinosaurs and plants found in places around this earth were destroyed in quick time. It is only a theory, that a single cell got all hot and bothered and self reproduced. There simply is not one shred of evidence that 'life' of all species got varying levels of intelligence through the eons of time.
I do get a smile over the new fad that is replacing TOE, aliens did it.
Anybody can trot out a bare assertion and label it "common sense". If that's all you've got, then you've basically got nothing.