Now reasonably explain to me how this one man can act as your enforcement arm?

Nothing else reasonably explained what had happened to the victim.

We are not a boarding party, Codrington explained reasonably to the senior captain.

"We can go down to the planet," Spock explained reasonably.

"All you have to do is listen to him," he explained reasonably.

"We had to be sure of you," Rhodes explained reasonably.

So, politely and reasonably explain to the supplier that it is his/her responsibility, not the manufacturer's.

He has not left us alone, Dirk explained reasonably.

"We can't turn your wagon upright with you in it," Wulfgar explained reasonably.