2) Improving society through being involved in the consumerist economy as it is a net positive force in itself.

My comment about "worth the name" was mainly about 2

Then on this we are naturally in agreement. No sane altruist (where sane includes 'able to adequately research the influence of important decisions) will do things that have a net detriment and there are certainly going to be some activities that fit this category.

I would add another category that specifically refers to doing things that are directly bad so that it allows you to do other things that are good.