 That's how strong Jesus felt about it. One of the many statements that if Jesus had never said that, or even though he had, still, today, if a Christian goes around speaking in terms as strong as that, they'll be like, well, that's un-Christ-like. You're saying that it would be better for someone to have a stone hung around their neck and be drowned in the sea? That's violent and terrible and un-Christ. No, it's literally Christ-like because that's literally what he said.