There is no alternative to power, no other position - not Christianity nor the Golden Rule nor brotherly love nor nonviolence; not self-sacrifice not the turning of the other cheek. For all these various abnegations of power by parts of a whole are, unwittingly, in the service of increased power to the whole; and the morality created by such renunciations is used by the aggregate to increase the power with which it then pursues more power.

Human being as individuals generally want the good, but as soon as they start thinking and acting in collective terms, i.e., in terms of a group, a mob, a race, a state, a nation, they tend to fall easy prey to evil. Since in the systemic only the system counts, all evil can be given a systemic status and thus appear justified. The legal system in particular has been used to justify evil.

Simply because power it self is bad. There is no such thing as good power in a same way as there is no such thing as peaceful army.