Here’s my reply:

It comes down to one simple question: do you believe that sometimes it is ok to initiate (that is, you are not responding to violence initiated against you) or threaten to initiate violence against others in order to achieve some end? Or stated differently, do you believe that sometimes the ends justify the means?

if you answer “yes” then you are not a libertarian but in order to not also be a hypocrite you should also happily accept whatever is done to you by the state in order that the state may achieve its putatively meritorious ends. Any objection to any state action in this situation would be hypocritical.

On the other hand if you answer “no” to this question then you are a libertarian and following this one simple rule in life will yield the correct answer whenever it is asked “”should the state do X?”