All these agencies are socialized. The army, police, and fire departments are not private. Nor are the parks. We all pay for them, so everyone can have use of them. That is socialism. The constitution is a living document, and it also is subject to majority vote. The constitution can be amended by a 3/4 majority vote of our representatives, or by a constitutional convention. Which has happened many times.
True, democratic socialism didn't get big till the great depression, but it was around silently before then. Libraries, public schools, the army, fire departments, things like that. But after the great depression it brought many great things that we enjoy taday.
You're one of those confused or misled people who don't see the difference between public service jobs and redistribution of wealth.
The police are paid by tax dollars. Police officers are doing work for which they are paid wages. Whether they are employees of the government or they are employees of a private corporation contracted by the government, they are nevertheless workers who are earning a paycheck. Same with military, fire fighters, librarians, park rangers, and road construction workers. All of those people are working for a paycheck. All of the goods and services paid for out of tax dollars are intended to provide services to the population at large.
Now let's contrast that to Medicaid or food stamps. Those programs are also paid for by tax dollars. The $$ is given directly to individuals as wealth redistribution. My tax $ is given to some other person for their own personal enrichment. No park visitor, crime victim, vehicle operator, or homeowner is receiving any service or product in return. This is not a paycheck for work done.
Whether or not we as a society at large want to be generous to help others is a completely different issue.
It may be true that some people get more benefit than others from these tax supported services. If you don't have a vehicle, you only get indirect benefit from the roads. If you don't visit a National Park, you've paid for something you don't use. Some of these services are insurance-ish, such as fire departments. You pay to have the emergency service there if you need it. Same with the police, though they provide a generalized benefit to the community even if you never need them to respond to your home. But that doesn't make these socialistic programs. No wealth is taken from one person for the sole direct benefit of others. Every person has the right and opportunity to go to the park, to call the fire department, to check a book out of the library.
When Joe uses food stamps to buy his bread, he is taking my earned cash and using it to put food into his mouth. That is socialism.
The Constitution is not a living document, it is a legal document with specific meanings. It means what it says, nothing more and nothing less. It is a legal contract no different than your mortgage contract or your employment contract. It is not subject to change just because you want it to mean something else. With an official, lawful amendment, yes you can change the Constitution just as you can change the terms of your mortgage and employment.