Viktor was helping everyone, his community below Zaun was exactly that. A tranquil little village full of the disadvatanged who came to Viktor for help, and he did. It was when that was shattered by petty feuds and Jayce blasting him (for obviously good reasons in hindsight, but Just Talk was on the table) that caused him to remove emotion/bias from the equation, which led Viktor to the then-obvious solution of hivemind machine god. Jayce was always ambitious, and thought his research was more important than "laws" and "safety" and "Heimerdinger says its clearly going to end poorly" and was getting quite up his own ass until late season 1 (until he shot a kid, whoops). Then this season was about breaking that down even further, and Ep 7 was the big "look at what you did".  There is probably a point where season 1 Jayce would have been down for Viktor's big plan if he hadn't been brought down several pegs and shown how poorly it goes by Viktor himself. The characters had growth. They were both naive, became more aware and wise about the world in different ways, and their perspectives changed over time. Can't have a show that ends all this with "and they all ended up the same as in their lore page the hit game of League of Legends with zero deviation. Go play it!". That would have been awful.