The difference between Rose and Dykstra, logistically, is that Dykstra has actually been considered for the wall, and hasn't made it in, though as I said above that's largely because the Phillies had a backlog of clearly stronger or more sentimental candidates for ten years (including two of his teammates and Green, Vukovich and Harry).
For instance in 2009 he, Kruk and Daulton were all on the ballot. Then Harry died. Kruk and Daulton got in the next two years and by then Lenny was poison.
Whereas Rose had never even been part of the selection process until this year, and the Phillies (like the Reds before them) had to ask MLB for permission to include him. So yeah, whatever the moral equivalencies it is obvious the people who run the Phillies and the Wall selection committee wanted Rose on there, and don't have strong (positive) feelings about Lenny. I imagine if he was included in a fan poll he'd still do okay; question is, do you drop out of consideration if you aren't voted in after a certain number of tries?
With Rose, the narrative was also that he'd done his time and paid his debt and apologized, even though that is highly, highly debatable. But that's what he, MLB, the Reds and the Phillies were selling. And then something new and worse came along.