No, I don't really see the slippery slope. If there were such a slope, I would imagine that decades into this piracy thing, we'd be sliding down it. Yet most people don't pirate. Strange?
So you really don't understand that it should be OK for everyone to pirate if it's OK for you? Would you ever tell someone it's not OK? If so, why? And what makes you special and different?
You've started with a retort to a point that some who would never pay for some copyrighted work are not a loss to copyright owner if they illegally use their work.
You've since expanded to everyone and SW development, and want to extend it to people who are willing to pay for the value a particular work provides them.
So let's go back to the beginning: can you please quantify how big is a loss to the copyright owner if one watches a movie they would skip if the only option was to pay for it?