Hmm, that's a very good distinction. But I think there's still a large overlap in which safety can include the prevention of intentional harm, not only accidents. For example, traffic bollards can stop a vehicle that has lost control, as well as stopping a deliberate ramming attack. There is no question that they are a safety feature but ethics doesn't really factor into it. People might debate cost-benefits but nobody really debates "shouldn't we allow trucks to ram their way into schools and hospital lobbies?"