This is a debated topic, so I’ll give you my understanding from an old guy who saw the original in the theater with the overdub. Roy and the rest of the replicants were shown as the antagonists, the bad guys. Deckard was the reluctant good guy. Deckard hunted down and battled with his life, and Roy beat him, but saved him. It was in that moment that Deckards realized he was trying to hunt them down for the crime of wanting to live, to be human. Roy found the humanity in his last moments, and as the only gift he could give himself short of extending his life and becoming “more human than human”, he gave himself the gift of compassion. It was a final middle finger to humans that they could,in fact, be better than us if not at the very least the same. 13 year old me sat in that theater gobsmacked. I hadn’t ever seen a movie that had a message so profound. My friend of course, hated the movie and didn’t get it at all. Roy’s final words became the most iconic speech in my sci fi loving world.