The welfare state is the main problem. But the point is, until the welfare gets removed, open borders creates MORE violence/theft than having enforced borders.
Keeping people out of a region doesn't require violence unless they initiate by trying to enter without permission. At which point it is self defense anyway.
Until welfare is abolished, closed borders is the universally preferable way to go. This isn't "aesthetic" as @adamkokesh suggests in the debate.
RE: The Immigration Debate: Adam Kokesh vs Stefan Molyneux (Video)