The idea that the destruction of the public domain "isn't a big deal" is incredibly short-sighted. The extensions of copyright driven by Disney lobbying have had the effect of shoring up corporate IP farms at the expense of individual creators, creating the uncreative pop culture state of today where corporate-sanctioned reboots of old properties are far more common than new ideas, and made vast categories of creative works that were seminal in creating our culture of today impossible to create. As a person who makes a living on creative work, you owe it to yourself not to be ignorant about this, especially when the current copyright regime is particularly harmful to independent creators. The topic has been written about extensively, but just off the top of my head
this might be a place to start.
The idea of the creator "deserving" something for their work has very little to do with what's under discussion here. Even original copyright terms covered works for about 30 years, which does plenty to protect a work at the time of its release and ensure a long period of control and economic benefit from it. What current law emphasizes isn't protecting the actual human beings who create something; it's making sure the the corporate entity that controls a work can profit on and control it for as long as possible, even if they get rid of everyone who actually created it.
No one except you is talking about a situation where the creative industry has no legal protection.