Never do a bad job good.

Unless it is the right thing to do,then do a good bad job.

"Sometimes bad is bad"

Huey Lewis

Where i work one of the lines my co-workers tell me is never do a bad job good because you will always wind up with the bad jobs. I have always had the problem of doing the the bad jobs good but that also keeps me employed.

The two most prevalent elements in the universe are hydrogen and human stupidity.

Albert Einstein

And on that note:

Never attribute to malice anything more easily explained by stupidity.

"Never attribute to malice that which is adequately explained by stupidity."

Robert J. Hanlon, Murphy's Law book two: More reasons why things go wrong! (1980) ISBN 0843106743 by Arthur Bloch page 52.

Wikipedia:

According to Joseph Bigler, the quotation first came from Robert J. Hanlon of Scranton, Pennsylvania, as a submission for a book compilation of various jokes related to Murphy's law published in 1980 entitled Murphy's Law Book Two, More Reasons Why Things Go Wrong.[1] The name was inspired by Occam's razor.[2]

A similar quotation appears in Robert A. Heinlein's 1941 short story "Logic of Empire" ("You have attributed conditions to villainy that simply result from stupidity"); this was noticed in 1996 (five years before Bigler identified the Robert J. Hanlon citation) and first referenced in version 4.0.0 of the Jargon File,[3] with speculation that Hanlon's Razor might be a corruption of "Heinlein's Razor". "Heinlein's Razor" has since been defined as variations on Never attribute to malice that which can be adequately explained by stupidity, but don't rule out malice.[4] Yet another similar epigram ("Never ascribe to malice that which is adequately explained by incompetence") has been widely attributed to Napoleon Bonaparte.[5] Another similar quote appears in Goethe's The Sorrows of Young Werther (1774): "...misunderstandings and neglect create more confusion in this world than trickery and malice. At any rate, the last two are certainly much less frequent."