It's not as one-sided as "Bitcoin is bad because it uses a lot of energy".

The legacy financial system is incredibly inefficient, if having to run Bitcoin alongside it for a while allows us to transition away from it eventually, then I'd say that's worth it in the long run.

Also, take a look at this: https://bitcoinmagazine.com/business/bitcoin-mining-drives-clean-energy

and this (regarding the fiat financial system): https://medium.com/galoymoney/lightning-as-a-retail-payment-system-part-1-7463c46342ef