Capitalism is usually thought of as a combination of private ownership of the resources of production with free market principles. Socialism is thought of as government ownership of the resources of production and government direction of the economy.
Republicans have criticized any effort by the Federal government to interfere with the freedoms of the private entrepreneur, be it a doctor or a businessman, as socialism. Thus they were against Medicare, calling it "socialized medicine," They are routinely against any regulation of business regardless whether its intent is to protect the public. They are against all social welfare programs for the poor as subsidizing people who should take care of themselves (Social Security is excepted from this argument because retirees have earned their payments).
And yet, Republicans have no problem with the billions of dollars that are spent by the Federal government each year to subsidize business in various ways, including tax loopholes that enable some of the most successful major corporations to pay no taxes each year despite making huge profits.
In fact, we do not have a capitalist economy. We have a hybrid system with the government subsidizing big business—as well as the poor, the elderly. and people in need. It also attempts through various economic measures to control the direction of the economy.
The government's expenditures to subsidize industry as well as the poor have the same justification—to insure a prosperous economy. If industry does not prosper, the economy suffers and unemployment rises. If the poor and others in need do not have sufficient funds to maintain a reasonable life style, they not only suffer personally, but they cannot participate in and thereby support the economy.
Government's role, in the famous words of the Declaration of Independence, is "to secure" citizen's "inalienable rights" to "life, liberty, and the pursuit of happiness." In our society, which is a money economy, one cannot have the freedom to pursue happiness or life without a modicum of financial resources. Everything the government does is in the larger sense done for this purpose. And so it is absolutely justified.
However, what is not justified is the money the government spends, or forgoes collecting through taxes, because it seeks to enrich the moneyed classes. This does nothing but create excess wealth and increase inequality; it in no way furthers inalienable rights. The very rich, the top 1% ($800,000+ income, $35.5 million household wealth), have so much excess wealth that they have no use for it other than conspicuous consumption and creating more wealth. Philanthropy consumes only a small portion of this wealth.
Since it is against the government's role in a democracy to enrich the wealthy with no benefit to the rest of the population —Reagan's "tickle down" economic theory has been proven to be baseless time and time again—all such largesse by government, whether in the form of tax cuts or tax loopholes, should be eliminated.
As a point of reference, in the years prior to 1944 the top tax rate ranged from 46-88%. From 1944-1963, the tax rate was above 90%. For the rest of the 60s and 70s it was more than 70%. From 1987 to the present, the top rate has mostly been in the upper 30s%.
If one looks at the country's GDP during the post-WWII years, the GDP was on average somewhat higher (3.6%) in the years prior to the Reagan tax cuts in 1987 than in the years since (3.2%). Since the high tax rates for the very rich did not have a negative impact on the economy—on the contrary, it seems to have been somewhat beneficial—there is no economic justification for this largesse. It's sole purpose is to further enrich the rich.
This largesse must be stopped so that the government has more money to balance the budget and provide resources where they are most needed to support its role to secure all citizens the right to life, liberty, and the pursuit of happiness.