Evil recycles – and the same evil can take many forms: but evil cannot just exist – it must act. The small evil is the key that unlocks the door to a bigger evil.
The “lens” of evil is a lens of distortion. If you have three children; and always praise and recount the goodness of two of them – and use the third one as an example of everything bad: the evil would claim that this is to promote recognition of the worth of those two – disguising that evil with a coating of self-serving gain, and cloaking the action with secrecy. Another day: one of the remaining two children would be found unworthy – and then; the last child will fall. Evil does not share.
If you give a government the power to discriminate against whoever they want, whenever they want, for as long as they want, in secret — there is nothing that you receive in exchange that will not be taken from you.