Perhaps because we aren't being short sighted about this.
If the exit poll is remotely accurate, witj that number of seats and that percentage of the vote share, there is no way that politic won't be changed in some way in the future. That is a huge chunk of the public that are VERY angry.
As an immigrant I am quite scared right now, and what I really don't want is people sneering and dismissing what a threat this represents to immigrants in the UK.
Sure, celebrate this election. It is the next one that I am worried about.