The world is all about power, and those too weak to obtain it.
In anarchy, if there is no democracy, then there is no any way to make any consistent laws, as who would make them?
If I can make my laws only on my property, and everyone else can make differrent laws on theirs, then that maybe works.
As for preventing terrorists, then anarchy obviously needs military funded by voluntary donations, and if threat rises, then people will donate to such military to be safe since its the only military not imposing force on them.
As for economic monopolies, I dont think there is a way to prevent that, but anarchy is supposed to reduce number of monopolies since without minimum wage and without taxes, then small buisnesses have no those additional costs, where with government, both small and large buisness have additional costs, but large buisnesses are better able to negate those costs by having larger amount of saved money at disposal.
As for people in need, then we all know that while government helps some, at the same time it harms others as there is no way for government to make money without taking that money from someone, including small buisnesses too. So the people in need are those the government took money away from, either by taxing their buisness either by taxing buisness which would otherwise employ them, and additionally government reduces the amount of money that goes to charity as if someone is forced to pay lots of taxes, then he will be less willing to give to those in need, and since we know that government's distribution of wealth isnt 1:1, so to say, if government takes 1 dollar from you, in no way it will give 1 dollar to the poor, but often the government wastes huge amounts of money on things which clearly dont cost that much, which causes waste of resources. Also, government has no real motivation to greatly help people in need and it only helps them partially and for political points, as the government will only help as much as it is forced by people and voters, and as we can see, that didnt work so far as countries still have high amounts of poverty but whats worse is that poor people have to do difficult jobs for 10 hours a day and 6 to 7 days of week just to get food and place to live, which is not significantly different from slaves in the past.