Overtime, Snoke was able to communicate himself to Ben through the Force. Ben was young and learning, and was still unfamiliar. I’m sure that he didn’t trust Snoke at first, but he listened to him and fell into his temptations and sayings about his family, as he was still isolated by them. Very much how Palpatine manipulated Anakin, as he was losing trust in the Jedi. Ben is not weak, but vulnerable, alone and depressed. Snoke acted as a mentor to him that Luke was never able to do for his nephew at his academy.
This is a great explanation, and it probably would’ve made a great story to tell. It baffles me they never show this to us. But then again…this is the story of the prequels. It’s too similar to Anakin and Palpatine. Plus I don’t like where they took Luke with this: “Murdering his Nephew?” Jesus christ eye roll
Either way, the audience never saw this still. I think you can sympathize with him because you seem to know more about his backstory than what the movies tell us. But to the average audience member, he’s not sympathetic at all.