That sort of investor does exist. People may absolutely want a return on their investment, and at the same time, they may be willing to get a lower return, but not always, if something serves a social purpose they believe in. That capital exists and it is possible to find it. There are individuals and larger funds that are increasingly concerned about what they are investing in. If there are social benefits, they are even happier.
We can see this in very local projects. For example, to save the last grocery store and service station in a town, the people in the community will invest $100 or $200 in shares in the business so that it survives. They don't always expect a return. The return may be very low, because that is not what they are looking for. They are looking for social utility and solidarity.
The same person may do that on the one hand, and on the other hand, invest for their pension fund and try to get the best possible return.