@JeremyCherfas a more fundamental question to answer is: who decides what is in the public good and whether the government should be the one providing for that public good?
Also it's worth noting that most people in a political party aren't in total lock-step with the party platform (i.e. they agree with many planks of it, but might quibble over the details). In general, I'm for LESS government (thus why I tend to identify more often than not as a Libertarian) but there are places where someone without a profit motive should probably be in charge (e.g. prisons, which are being privatized in the US).