I mean in ROTJ Luke goes on and on about he won’t kill Vader, but as soon as he threatens Leia he almost kills him. I’m sure Luke was shocked and never expected Ben to have those thoughts or plans. If he didn’t love Ben he wouldn’t have felt so ashamed himself for what he thought about doing.

Why wouldn’t it be personal if it was all of his students? This isn’t like Luke’s 10th year of teaching high school history or something, this is the first generation of new Jedi. All of his students, all of his responsibility. He probably felt like a parent to all of them.

EDIT: Sorry to bring this up! I know this is kind of conversation just goes in circles. I’m sure there’s a good way to edit the vision to make Luke’s response be more reflexive, but honestly I think adding the Palpatine laugh allows people who aren’t crazy about the scene to interpret that as Palpatine influencing his vision and coaxing his fear/anger, just like how he saw Vader coax Luke on the Death Star so long ago.