Ok dude, I've tried to have this discussion civilly but you very clearly took offense at some point during this exchange.
I will spoonfeed you this piece of information, then I will stop engaging in this ridiculous interaction. Geoffrey Chauncer, author of the Canterbury Tales, mentioned Nero's callous indifference to Rome burning. Shakespeare wrote of him playing on his lute. The idiom spawned from various other authors referring to stringed instruments and their players as fiddles/fiddlers. You can educate yourself on the usage of the term fidicula and what it translates to/where it leads etymologically, I don't care to. You should probably look up the idiom as well.
Something tells me Chauncer, Shakespeare, and the idiom itself will outlive you.
Edit: for accuracy.
Edit 2: I'll take a step further: This article goes into the historical inaccuracies of the phrase and how/why it came to be.