When people make a capital gain on a property...or on shares or from a business they've already been taxed.
You pay your mortgage from your after-tax wages or salary you buy shares from after-tax savings and of course, any dividends are taxed along the way.
If you make a gain when you sell your business or your farm that's your compensation for the risk you took and all the unpaid work you've put in.
The question I'm left with is if a politician, say for example a Prime Minister, truly believes in something but realises they'll be out at the next election if they push that belief is their integrity gone?
Jacinda Ardern may well have saved Labour's chances at the next election, but what's the point of being elected with such an important part of your wish-list gone?