[nodamage]

"We" refers to society that you wish to convince to adopt Bitcoin as a currency. As has already been mentioned, the mere fact that people are willing to spend electricity on mining does not inherently demonstrate that it is a good use of such electricity.

Again, I find this defense to be incredibly tautological:

"This approach to securing a distributed ledger sure seems to waste a lot of electricity."

"But it's not wasteful because it secures the ledger..."