Loss aversion is a real thing - people can and do decide to go brick and mortar because of being afraid of package theft. It isn't realistically a big issue but people care about it a lot.

As for why I would guess wanting better rates from turning bits to cash.

  Shoppers do not care about package theft

Collectively, shoppers pay for all package theft.

That is true. But we also pay for pensions, profits, advertising, union-busting, pollution, and countless other things we may not want to pay for.

Ultimately, the consumer only cares about what product he is getting and what price he has to pay. How the company juggles its losses or where they come from is of no interest to the product purchaser.