RSRH:
Learning Torah all day, and doing nothing else at all, IS THE MOST productive way to serve society.
And no one should object to donors who WANT the zchus to pay the Kollel yungerleit, just like you don’t object to someone who wants to buy a baseball ticket paying those lowlife players.
Learning Torah is doing something, and not just something, but everything. AND they are keeping you and I safe, and keeping the world running. Just by sitting and learning Torah all day, and doing NOTHING ELSE.