For the last bit this is a very commonly talked about idea, often referred to as "the pipeline problem". There is evidence that the level of which minorities gr

For the last bit this is a very commonly talked about idea, often referred to as "the pipeline problem". There is evidence that the level of which minorities graduate with CS degrees outpaces hiring though, suggesting that the pipeline can't be blamed alone. The first part about why diversity is important has been covered ad nauseum so you can find those arguments and agree with them or not.