This is a classic divide between say leftists or rightists in general and anarchists by definition. A leftist or a rightist might oppose a specific State or governmental body because they are opposed to what it does or how it works, but an anarchist opposes states and governmental bodies as such. The reasons for unequivocally opposing such bodies varies by particular philosophy, by which I mean anarchism is a conclusion one draws from something else which then itself becomes the premise for a body of practices, but some examples follow, which might be embraced singly or collectively:
- States and governmental bodies are authorities over me and I reserve the absolute authority over me for myself.
- All power corrupts and absolute power corrupts absolutely, so no entity can be trusted with the power of a State, and that includes the People.
- The State and other such bodies are elements of Civilization, which all together must be torn down for humans to flourish.
- Humans best flourish when they direct their own affairs and so entities and organizations which alienate them from their own agency must be torn down.
- Third parties and intermediaries interfere with the free exchange of ideas, peoples, and commerce, in which the States and other governments are all no better than vast mafias which must be dissolved for the total intercourse of humanity to emerge.
There are definitely others, and myriad variations or nuances of each, as well.