"Every cloud has a silver lining" (something good comes from every bad situation) Not quite the same but similar idea (people have different likes/dislikes): "One man's meat is another man's poison" "Different strokes for different folks"

You have actually combined two idiomatic phrases there. We usually describe such a thing simply as "being a double edged sword", or we say that "it cuts both ways". But we usually use one or the other, not both. I can't immediately think of another idiom that means quite the same thing. One that is a bit similar is to describe something as being "a wolf in sheep's clothing", but that implies more that it only looks beneficial but is actually dangerous.

This is a really fun post..:) "The less you know the better you sleep at night" Similar to ignorance is bliss. Meaning: Sometimes you might not want to know about something that can cause you stress or worry. Most commonly said by someone to another person when they know the situation can cause these conditions for someone else and you are trying to spare them. Mike: "What was discussed in that huge meeting you were in? There were a lot of high level managers in there for hours, must've been really important." Jim: "The less you know the better you'll sleep at night" Mike: "Now I have to know what happened cause it sounds really bad" Jim: "Sigh...ok. They decided that they are closing multiple departments in two months unless they see major revenue growth. One of those departments discussed is yours." Mike: "F*ck!"

Sorry for the double post put my response in the wrong place "Better the devil you know (than the devil you dont)" Short version and full version. We tend to say the short version since people are familiar with it. Meaning: When dealing with someone who is not ideal or frustrating to interact with, there is probably always someone worse. So you choose to deal with this person rather than take an uncertain chance that the next person will be better or possibly worse. Mike: "My boss is annoying he never remembers anything. I have to constantly repeat my projects to him. I wish they would replace him." Jim: "Better the devil you know Mike" Mike: "yea yea i know" Mike: "Well they finally replaced my boss and the new one all he does is yell at me over every little thing. I wish they wouldve just left the other guy in charge cause this guy is so much worse!" Jim: "Told you, better the devi..." Mike: "f*ck your devils Jim"

"Better the devil you know (than the devil you dont)" Short version and full version. We tend to say the short version since people are familiar with it. Meaning: When dealing with someone who is not ideal or frustrating to interact with, there is probably always someone worse. So you choose to deal with this person rather than take an uncertain chance that the next person will be better or possibly worse. Mike: "My boss is annoying he never remembers anything. I have to constantly repeat my projects to him. I wish they would replace him." Jim: "Better the devil you know Mike" Mike: "yea yea i know" Mike: "Well they finally replaced my boss and the new one all he does is yell at me over every little thing. I wish they wouldve just left the other guy in charge cause this guy is so much worse!" Jim: "Told you, better the devi..." Mike: "f*ck your devils Jim"