Police and firemen are socialism. If they oppose socialism, they oppose police and firemen, and infrastructure, and----and----and. Either they have no idea what socialism is, and are just parroting right wing rhetoric, or they are liars. I suspect both.
That certainly is one way of looking at it. I look at it another way though. It goes like this:
There are certain things that there is a general consensus are outside of the general populations desire/ability to provide/do for oneself. Law enforcement, fire fighting, national defense, and regulating various activities are among these. Therefore, as a society, we have developed a means to pool (taxes) our resources (money) and to employ those with sufficient expertise (presumably) and desire to do/provide these things for us. Let me give you an example.
Attempting to put a house fire out with what resources are generally available to the occupants of said house would be futile. So, we agree to pay taxes, thus pooling our money, to employ properly trained and equipped fire fighters to do this for us. We could, instead, have a social agreement to assist our neighbors in such endeavors, and bring whatever resources we have, and are willing to bring to bear. However, given the advancements in technology, this is no longer seen as the best way of doing this. So, we continue to utilise government funded fire fighters. Given that our country is governed "By the people", it, therefore, stands to reason that, though I do not "sign their paycheck", I am, nevertheless, the employer (in part) of my local Fire Department, as such they answer to me (in part). Now, we have also decided that having every citizen part of the decision making process on a daily basis is impractical, therefore, again, we employ others to be our proxy in such matters.
Conversely, in Socialism, while they undoubtedly still have Fire Departments, the average citizen has NO means by which to effect how, when and where FD resources are procured and spent.
Having said all of that. The example of a FD is a poor example to use, to be kind. A much better example would be how we "help" "the poor". Under pure Socialism, it's the government's role to do all that is seen fit for "the poor". Under pure Capitalism, it is their own responsibility to provide for themselves, however, as a morale person I have a responsibility to my fellow person to help those who are struggling. This is why John Adams said,
"Our Constitution was made only for a moral and religious people. It is wholly inadequate to the government of any other
."