Voldemort after the point he's divided his soul into the Horcruxes, no. But back when he was Tom Riddle? Yes, I'd give him a chance. He had a terrible, terrible upbringing and if he had support when he was younger, maybe he could have used the immense power he had for good things. And Grindelwald did horrible things, but he believed what he was doing was for the greater good. Which is kind of exactly what Jacen Solo and Tahiri Veila believed they were doing, and we accept them as part of our community, so yes, I'd offer the same to Grindelwald.