No lynch at 5v1 with investigation alive is not a bad plan though?
I believe it's a bad plan in nearly all cases because you rely on forfeiting your chief weapon to eliminate scum (lynching) and hoping that the night action will prove favourable (Scum won't kill a key figure).
In this particular case, I felt it was a bad idea because the odds of it being favourable are low (I assume all Scum are equally as smart and fallible as we are), while the negative side-effect of prolonging a Day phase rife with lethargy and general lack of care had high odds of coming to pass. Had we elected not to lynch and I had not been killed, I'd probably have spent most of the new Day phase twiddling my thumbs waiting for the rest to settle on a target.
I think the general apathy towards scum hunting from this game wouldn't improve by just making the game that much longer. Lynches give a great deal of information because it eliminates one person, lends information about the arguments people used, and makes the pool of suspects smaller. And you still get a Night action during that night.
We could probably argue this 'till we're blue in the face, but I am a staunch proponent of lynching every single Day phase until all Scum are eliminated, with the exception of very strange setups. I don't see myself changing that stance, so I'd rather agree to disagree here. I know how stubborn I am. If I offended by saying it was a bad plan, I'm sorry, it's nothing personal. I'm just opposed to forfeiting a lynch. Mafia is serious business to me.