What is the theme for this poem?

On the night of the execution
a man at the door
mistook me for the coroner.
"Press," I said.

But he didn't understand. He led me
into the wrong room
where the sheriff greeted me:
"You're late, Padre."

"You're wrong," I told him. "I'm Press."
"Yes, of course, Reverend Press."
We went down a stairway.

"Ah, Mr. Ellis," said the Deputy.
"Press!" I shouted. But he shoved me
through a black curtain.
The lights were so bright
I couldn't see the faces
of the men sitting
opposite. But, thank God, I thought
they can see me!

"Look!" I cried. "Look at my face!
Doesn't anybody know me?"

Then a hood covered my head.
"Don't make it harder for us," the hangman whispered.