Yes, but this is also true of a question like “is it safer to fly or drive.” Doing the comparison makes the most sense when there’s a flight you could take and

Yes, but this is also true of a question like “is it safer to fly or drive.” Doing the comparison makes the most sense when there’s a flight you could take and also a way to drive there. In this case, a practical comparison would be between taking a taxi versus a driverless car service in the same region. Maybe the driverless car avoids highways and takes longer, but you can still ask which one is safer.