How does this climax connect to the theme "Evil can never truly hide itself”?

“Utterson,” said the voice, “for God’s sake, have mercy!”
“Ah, that’s not Jekyll’s voice—it’s Hyde’s!” cried Utterson. “Down with the door, Poole!”
Poole swung the axe over his shoulder; the blow shook the building, and the red baize door leaped against the lock and hinges. A dismal screech, as of mere animal terror, rang from the cabinet. Up went the axe again, and again the panels crashed and the frame bounded; four times the blow fell; but the wood was tough and the fittings were of excellent workmanship; and it was not until the fifth, that the lock burst and the wreck of the door fell inwards on the carpet.

–The Strange Case of Dr. Jekyll and Mr. Hyde,
Robert Louis Stevenson

How does this climax connect to the theme "Evil can never truly hide itself”?

By breaking down the door, Poole and Mr. Utterson are finally able to find Dr. Jekyll.
By breaking down the door, Poole finally reveals his destructive instincts.
By breaking down a door, Mr. Utterson and Poole finally reveal the evil character, Mr. Hyde.