Even last mile delivery isn't that polluting... We're talking things like steel and concrete production, massive ocean container ships, coal plants, the extraction of every type of ressource, etc...

Again, the things you mention are putting the onus on the consumer and are relatively small.

Everything consumers and non-industrial businesses do accounts for only 13% of global emissions. The entire global agriculture system accounts for only 10% of emissions and of that, 80% occurs during the production stage.

By contrast, concrete alone is 8% of global emissions. Forestry is 10%. Steel production alone is 9% of all emissions. Simply producing these base products creates more emissions than absolutely everything consumers do. Energy production is 25% and of that, industrial producers use most of it.