"...it's an approach that doesn't necessarily effect any real or positive change in the behaviour of companies within excluded sectors."
Instead Kiwi Wealth's white paper points to a need for investment managers to take environmental, social and governance considerations into account.
"As a bare minimum, zero-tolerance exclusions are helpful for those sectors that are illegal or have strong public policy arrangements against them, such as whaling, tobacco and controversial weapons.
"But to best meet responsible investing and fiduciary objectives, you have to incorporate ESG factors at the security level as an active part of the investment process."
But O'Grady said exchange traded funds, which many KiwiSaver providers use to get low cost access to global markets, don't allow fund managers to do this.