Some things need more than a simple majority to pass, but I don’t think this is one of them. Like Democrats, Republicans don’t necessarily all vote the same. Some are probably resisting for whatever reason. Could be good reasons, could be bad. But the opposing party is a better scapegoat than your own and the sad reality is that most Americans are not paying enough attention to notice the holes in the logic of what they’re saying. So that’s why they’re blaming Democrats.