I actually sympathized with him and felt bad for how lonely, isolated, and betrayed he was by his family.
Really? That’s not what I pick up at all. How do you think he was betrayed?
Han and Leia, while they loved him, didn’t spend enough time with him as a child. Both were busy leading the Rebellion (now the Resistance) while Ben felt isolated at times. Han was always jumping back and forth from still smuggling (before he went back full time after Ben’s downfall) and Leia became a hard-working senator in the new Republic. Both of their busy lives took up the majority of their lives when Ben was younger, as if he was abandoned. Even when they sent him to Luke’s academy, Ben still felt that he was being looked aside from his family, adding more to his depression and loneliness. This is the same abandonment and lonely feeling that Rey had been suffering from on Jakku. This is what led Snoke to manipulate him, as he was in a vulnerable place in his life and he was strong in the Force. Snoke had been successful in manipulating Ben at a young age, making him feel like he had a place with the him and the Dark Side. Once Luke had seen the corruption Snoke was causing to his nephew, he acted upon instinct. Rather than attempting to comfort his nephew and help him understand and be a good uncle, Luke thought only about the academy he had built. This is why Luke took out his lightsaber, thinking about his work over his family. This is something that Luke, Han and Leia all failed in. It isn’t until Luke realized what he was about to do when igniting his saber. Ben took it upon this moment to turn to the Dark Side and destroy Luke’s academy at this point. He still could’ve been saved in that moment, but because of the mistake Luke had made, the abandoning acts made by his family, and Snoke’s manipulations, he was led to believe that his uncle was going to kill him, which he very nearly thought about doing. Ben acted upon self defense and took Snoke’s advice. Even when Rey asks Luke if he created Kylo Ren, you could even see that he had a part to play in Ben’s turn.