Sure, as a politician you shouldn't be favoring homeowners more than people who don't currently own a home / younger generations. Passing policies that increase home value necessarily makes it harder to own a home than before, and also raises rent prices.

Homeowners essentially hold everyone else hostage because they are able to vote and youth/the unborn/many immigrants cannot. So politicians are highly incentivized to pass policies that increase home values. Of course, not everyone who can vote is a homeowner, but politicians and wealthy/connected people disproportionately are.

The main way to increase home prices is to make the monthly payments lower than before, by either decreasing interest rates or extending the maximum mortgage loan length. In another one of my posts, I explained why this will actually simply raise the values of the homes without affecting mortgage payments very much. This has the added effect of pricing a lot of people out of home ownership compared to the previous market, because this does increase the down payments that you need to make. Thus the increase in rents.

Regarding tax, if you let interest be deductible from your taxes, you are making mortgage payments even lower. Again, this raises home value because mortgage payments will again revert to what they were before.