We have a state now though, has thievery and violence been stopped? How many thousands are in poverty, how many are killed in global wars waged in the name of profits? There are states where theft and murder are extremely rare, and states where it is common. What is the difference between the conditions where it is common and uncommon? Is a top-down control and manipulation the only way to reduce violence?

Anarchism works all the time. It's more than a political structure, it's an idea about how to organize relations between people, and there already are many groups that are active that function on anarchist principles.

Any group that collects itself in the modern world as anarchist, like anarchist groups in the Spanish Civil War, are heavily repressed by state forces. Capitalist states work together to discourage anarchist ideals even more so than communism because of the possibility it has for threatening traditional power structures.