1. No serious politician in the US has proposed socialism, that is the state owns the means of production.. No politician, including Bernie Sanders, is suggesting that we follow,
 Brazil, Venezuela or any other far left country. 
2. There are roughly 20 1st world countries. All, all, except the US have universal health care and more generous welfare benefits than the US. All 50+ countries with lower taxes and smaller government are 2nd & 3rd world nations.
3. We have the least efficient healthcare system in the world. While we spend way, way, more of our GDP than any other country we get worse outcomes. We are ranked overall 37th. If we went to single payer and lowered our share of GDP to Canada's (which has equal or better outcomes) we would give businesses and individual 5.5% more of the GDP to spend as they please. This dwarfs any currently proposed tax cut. As an example, all corporate taxes only add up to 2% of the GDP, and no one is suggesting eliminating all corporate taxes.