They matter to people who aren't Utilitarians (like me!). I'm much more interested in motive than I am in outcome (although I like Good Things, just like everyone else).

Here's a hopefully intuitive framing: actions are built on outcomes, while institutions are built on motives. It's hard to imagine a consequential derivation of fundamental and inviolable human rights, for example: there will always be cases and circumstances where a consequential view of morality enables you to engage in casuistry to suit the occasion. I'd much rather build (and live under) practical moral systems where things stay right and wrong.

(To be clear: motive itself is not the moral object, in my view. Motive is merely the thing being questioned. The moral object is the moral law.)

Rich people give to charities to aggrandize themselves. Charities, needing donations, trim their sails to appease self-aggrandizing rich people. Not hard to see how this can lead to the charity in effect doing more to serve its patrons than the people it actually claims to help, and based on some up-close experience, I would say that is not an academic concern.

I make no claim at to where our current world is on this spectrum, but there is some point on it where a world full of some tiny number of extremely rich people who shower money on the poor, even to the point of material scarcity largely vanishing, but everyone in this world is a dickhead to each other, is a worse world than a world that still has material scarcity but is full of people who honestly and legitimately care for each other.

This is probably far more obvious at small units like families, where we are all well aware of the existence of absolutely miserable rich kids who might live short, drug-addicted lives that end in suicide, in spite of their parents giving them all the money in the world.