Because that can't be trivially understood to be wholly unnecessary. Who is to say that it doesn't make programming a lot faster and saves a lot of development

Because that can't be trivially understood to be wholly unnecessary. Who is to say that it doesn't make programming a lot faster and saves a lot of development time? Conversely, Bitcoin really is unnecessary given all the alternative investment, payment, and timestamping schemes that don't use proof of work. It's a matter of picking the easiest battles first. Bitcoin -> clearly evil -> why not move to another investment? Why not tax it for its environmental damage, like we tax other things that cause damage that the government later has to clean up?