Chesed Shel Emes

I've recently been at a few funerals and I have been thinking about that which we say that the Mitzvah of burying someone is a Chesed Shel Emes because it cannot be repaid.
It seemed to me that extra hasbarah was called for because it is possible for a variety of reasons to gain benefit, e.g. from relatives or onlookers who now respect you more etc.
So the focus is on the deceased, and this applies whether you them or not. How does one truly express friendship and brotherhood? It is a true expression when it is done without calculations and that expresses itself when the fellow is deceased and there is no possibility of give and take and therefore this is the truest expression of friendship. And this is perhaps even better expressed when you didn't know the deceased, it is even a truer expression of Ahavas Yisrael.
We can connect this to Emes made up of the letters Aleph, Mem and Tuv. There is no hefsek.
But like everything in the world there can be corruption mitzad taruvis tov v'ra, So it is upon us to make sure that like everything else we need to make sure we are focused on the right reason for it.