How ever that may sit with you in fallout skyrim doesn't really lend it's self to such things hmmm let's see, "I'm so evil I'm going let Aldin destroy the world mwahahah...oh crap wait I'm part of the world...hmm probably should rethink my plan...otherwise i won't so much evil as dead..." Wanna be evil, be realistic, be ruthless, steal murder be rude and callus, but protect your own interests. Save the world but make sure you come out on top. Nv handled this ok IMO giving you the optinity to finish the main quest preserving the objective however you finish but in what ever postion you feel. Remember a civil war is brewing in sr, how about you save yourself by killing the dragons but at the same time play the two sides against each other getting the best for your self out of it. Sound more evil to me. Letting aldin win isn't evil so much as insane, want an insane character then collect only spoon for 300 hours or do as the post above suggests and pointlessly kill everyone before the dragons do, "stupid dragon think they can cause mass genercide better than me I'll show them..." ect

Since children are in the game you won't be allowed to be evil, ever. Also, you are supposed to be a hero, heroes aren't evil.

Ppl are as heroic or evil as history remembers them... Save the world, great! [censored] a few ppl in the process, mehh who cares. Evil to the exstent of one sidness is pointless and makes 'no' sence out side the ideas the lore supports like the other planes/beings, ect