The argument isn’t necessarily that investing in ESG funds leads to a positive impact, so much as that it avoids a negative one. For example, consider two hypothetical investment funds:
Invests in the S&P 500 index
Invests in the S&P 500 index but excludes any company which manufactures or supplies landmines
All else being equal I think it’s difficult (although not impossible) to argue that shifting people away from fund 1 and toward fund 2 doesn’t have a net positive impact on the world. So I suppose the debate hinges primarily on whether all else is equal (i.e. in terms of fees, risk, and expected growth) and, if not, how to account for those differences within an ethical framework.
I agree with the criticisms you made but would add that some people who are uninterested in the EA maxim of “do the most good” may be convinced to “do the least harm”. If these people (who won’t be donating their investment gains to effective charities, regardless of how large those gains are) can be nudged towards more ethical products then this could have give a positive benefit.
I’ve heard of some investors allocating a small percentage of their portfolio towards highly speculative “moonshot” style investments. The logic being that it’s impossible to ever accurately forecast how some types of investment, such as start-up companies, will perform in the longer term, but that they carry the potential to offer outsized returns.
What are your thoughts on treating charitable donations similarly? For example, giving ~95% of your donations to charities for which there is a strong evidence base to back up their efficacy and giving the remaining ~5% to “speculative” style charities for which there is less objective evidence?
If you had to choose a “speculative” charitable cause, what would it be?