Hmm..Fair point,
but counterargument…

We bring Paps and Sans closer while we murdered Snowdin residents.
We fulfill Undyne's dream by trying to kill Monster Kid.
We got Alphys to act and get over her fears when we killed all of the Underground.
We got Sans to do something other than be lazy and watch as we send his world into nothingness.
Its amazing how many great things come out of facing a common enemy, the only sad thing is that it couldn't last long enough before we ended that as well.