That seems... incredibly reasonable and helpful.
(no sarcasm)
"The speech was drafted with the assistance of Stanley Levison and Clarence Benjamin Jones[17] in Riverdale, New York City. Jones has said that "the logistical preparations for the march were so burdensome that the speech was not a priority for us" and that, "on the evening of Tuesday, Aug. 27, [12 hours before the March] Martin still didn't know what he was going to say"."
I'm not so sure these people would appreciate the fact that you think they should work without being compensated for it, or that somehow, compensation and/or ownership isn't a good reason to do something.
Doesn't matter if it's churches or playing in jazz clubs, writing and making music for a living is a tough business. I've worked some churches that paid quite well - at least industry standard - and I could go online now on CraigsList and find 5+ requests per day asking for music volunteers because religion. In my experience, churches are simply another ill-informed group that frequently want all the benefits of live music without compensating for it. Same goes for well-meaning volunteer organizations.
This happens to physical products too, I don't see how specific individuals not wanting to pay for something has any bearing on the existence / effectiveness of copyright.
Secondly, they're not the beneficiaries of the copyright: it belongs to the King estate.
Are you stating that without copyright no one would write speeches? Would people have just abandoned the Civil Rights movement because of a lack of copyright? That seems like an extreme view.
> To promote the Progress of Science and useful Arts, < by securing for limited Times to Authors and Inventors > the exclusive Right to their respective Writings and Discoveries.
The whole point of the system is to encourage products that are successful enough to make some royalties and then become public domain.