You are comparing apples and oranges.

> Why oppose a Russian millionaire buying an LA townhouse, but not a Texan millionaire buying the same townhouse?

A Texan resident is subject to the same federal financial rules and regulations when earning an income in the US as a LA resident. The Russian millionaire can earn millions in a different country under unknown rules.

> Why oppose a Russian millionaire buying an LA townhouse, but not a Russian millionaire buying a Degas painting?

Buying a Degas painting is a luxury, having a home for your family to live in is a necessity.

> Why oppose a Russian millionaire buying an LA townhouse, but not a Russian tourist buying a ticket to Disneyland?

Again buying a ticket to Disneyland is a luxury, not a necessity.