So why do Mum and Dad keep voting for this?

From Moneywise:

A survey carried out by insurer Legal & General and the Centre for Economics and Business Research (CEBR) has found that 17% of so-called ‘Bank of Mum and Dad’ lenders are already worse off, or would be, after providing financial help to the younger generations.

One in 10 (10%) said they felt less financially secure, while 4% postponed retirement after supporting their family to get onto the housing ladder. The research showed that more than a quarter (26%) of women felt they had sacrificed their living standards versus 13% of men.

More than a quarter of homes bought in 2018 backed by the 'Bank of Mum and Dad'

Funding public services out of a 'service charge' on land values (aka Land Value Tax) instead of imposing taxes on output and employment might well reduce selling prices, but every £1 paper loss incurred by Mum and Dad saves each child £2 in future mortgage repayments.

Even if selling prices didn't change much (as is quite possible), every £1 paid in LVT will save the next generation £1 in mortgage payments, as well as saving Mum, Dad and every child about £1.50 each in other taxes.

That's what I call "helping your loved ones get on the housing ladder"!