In a two part interview with Laura Prudom, Seth Gabel talks playing Arrow's new supervillian (Part 1), Allegiance and the end of Fringe (Part 2):

Prudom (HuffPost TV):
I loved that there was no attempt to demonize any of the characters. Everyone is morally justified in the decisions they make, and it's very much about the shades of gray, rather than everything being simplistic black and white, right and wrong.

Gabel: Yeah, it’s up to our audience members to decide morally what you think is right. And at the end of the day, for these characters it’s not about right or wrong. It’s just about kind of honoring yourself and the people you love.