Krul accepts the performance was underwhelming.
"I know that is hard but the fans have to stick with us," said the Dutch keeper. "I understand why everybody's frustrated because we've got 12 points and that's the hard facts.
"I have been through bad spells at other clubs but we were playing really badly.
"I've never been at a club that played so well and not picked up points, I just don't get it.
"I go home and ask myself the same questions. What can we change? They were ruthless and we were not. But you couldn't say Villa played great.
"The only way we're going to change this around is just work our socks off and believe in each other, because if we start pointing fingers then that will end in bigger trouble."
Krul admits the Canaries' face a mammoth task to pull off an unlikely relegation escape. City return to action swiftly on Saturday at home to Tottenham.
"It seems like the last six, seven games, we've been saying the same thing.
"And it's not what people want to hear," he said. "But you have to be objective and see the facts, we're playing some great football, we are creating chances. But whatever it is, luck, a bit of quality, in the end we're lacking at the moment."
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