Why has so much self interest been lost from the sales pitch for policies that clearly stand to benefit normal people?

In politics, like murder, motives matter
Why has so much self interest been lost from the sales pitch for policies that clearly stand to benefit normal people?
Opposition parties need to be very different in the years to come, but not to eachother. There is much that unites Labour, Lib Dems, Greens,
Electoral alliances breach our democracy but maybe that’s OK in a broken system.
The chaos from Downing Street has helped the opposition no end. But will a General Election fracture their alliance?
A week of panic in Government as Corbyn now seems the PM’s last (unlikely?) hope for rescue.
The benefits of an electoral pact are now achievable thanks to remain-motivated voters – even though remain is not the main reason it should happen.