My evidence: Boris and Trump - who are ostensible conservative-republicans. Supposedly our saviors from disaster.
Those who oppose the Left agenda were told that the last elections were vital to win - or else. They were won...
But who could deny that exactly 'or else' has-happened, is-happening, and continues to get worse? That The West is in a terrible, and terminal state? We are in the midst of the greatest disaster - politically, socially and spiritually - for centuries; and in scale, rapidity and unopposed effectiveness - the worst in the history of the world.
Actually-existing politics is a snare, a delusion, a time waster, a sin.
All mainstream politics Without Exception is 'controlled opposition': a football league 'contested' between teams all owned by the same consortium.
If you don't recognise this yet, then I don't see what possible evidence ever could possibly convince you...