Ahh. But that would be making the case that Egoism is evil while Vigilantism and Ego-centricism are not.
I'm making an important personal distinction here.
Egoism, reworded here to make a point, is the idea that one's primary priority should be oneself. Actually, according to definition here, its not just the primary goal, its the only goal(I'd argue that the definition needs to be changed in this respect). I don't know why, but Wikipedia has chosen to erase all entries for egocentricism and every definition I see for egoism would better represent egocentricism. Egh.
http://en.wikipedia.org/wiki/Rational_egoism
At any rate Egoism's opposite is Altruism. Or placing others above oneself.
http://en.wikipedia.org/wiki/Altruism
I, personally, do not feel egoism is necessarily evil, except in the extreme form there-in. In fact, I practice it, in a form. My thoughts on the subject are to state it as priorities:
1. My needs for living
2. Other's needs for living
3. Maintaining my standards of living
4. Maintaining other's standards of living
5. Whatever else I need to be comfortable
6. Whatever else others need to be comfortable
I usually do not get to priority 6 unless the task involved has little or no cost to me(something I percieve as worthless or little value to myself). When I don't make human mistakes or fall prey to impulses anyways. Hey I'm only human

.
However, self-centered complete lack of concern for others is a different matter entirely. Vigilantism is essentially saying that you ARE the law. That you know everything about whats right. Essentially, vigilantism is ego-centric, and I associate ego-centric thinking with the concept of evil. My problem with vigilantism is Judge Dredd. Think about it, the primary difference between the two is that Judge Dredd enforcement officers are an organization of people that hold this opinion about eachother, instead of an individual. Its the logical next step of the concept of Vigilantism. Thus, its evil in the same sense that FF villains are evil.
http://en.wikipedia.org/wiki/Vigilantism
http://en.wikipedia.org/wiki/Judge_Dredd
So, and no offense, I DO kind of feel that vigilantism is half-baked. I accept that you feel otherwise, but I think I have good reasons. After all, most villains want to CONTROL the world, not destroy it, right?
edit: AHAH! What I'm looking for is not Ego-centricism but Egotism. That helps. Egoism and Egotism. Sounds good to me.
http://en.wikipedia.org/wiki/Egotism
edit2: I swear the philosophy section for Wikipedia used to be so much better, but someone went through and reorganized it, and now it sucks.
I should also point out that evil and good are poor concepts anyways. Point being that if we accepted those concepts, evil would be egotism(of which vigilantism is a subset), not egoism.