Because they are the best of bad bunch.
The Greens are nutjobs
Lib Dems completely useless
Labour the party of tax rises and morons like Diane Abbott, Emily Thornberry and Rebecca Wrong Daily.
No thank you.
This is the best answer to my poorly phrased question so far. Unfortunately tax rises are inevitable whoever is in charge now.
Not that I see tax rises as a bad thing but I get that view.