Theologically Lucifer (Satan) tempted the humans to the Tree of Knowledge ultimately with the goal of having them terminated. When this didn't happen the first destruction of heaven (it's actually been destroyed 3 times) occurred and Lucifer was cast out along with his generals who took to his side against Yahweh. The entire purpose within the context of that story for Lucifer's behavior was to see mankind die and that behavior has not ceased where without Yahweh's interference (as seen in Job) Lucifer would gleefully rid the world of humans through torturing them to death; keep in mind that one of the stipulations made regarding the challenge between Satan and Yahweh regarding Job was that he not be killed and this was no accident. Lucifer / Satan would have slain Job had he been given jurisdiction.
It's a bit more complex than that. Actually Lucifer wasn't jealous of humanity he was upset at the fact that Yahweh gave his favor to humanity. The difference is subtle but Lucifer has no desire to be human at all; instead supposedly his pride as the Angel of Light and Music (two pretty important things) got the better of him and when he saw that little naked cosmically insignificant molemen got the attention of Yahweh he lost his cool. The entire idea of the Tree of Knowledge plot was to show the fault in the creation of mankind to begin with and how flawed they were.
The last one is iffy: I watched a TEDtalk on the matter of being honest about people dying, esp. In emergency situations, and the general consensus is you should actually tell them the truth. Lying to them tends to worsen things.
I thought you might say that. I'll reword it: Is it evil for a hungry child to steal bread to eat? Is it evil to kill a man raping your mother? Is it evil to sooth a dying man's fear through lies? I'd say all three acts are the opposite of evil.
Exodus 20:13, “You shall not murder." It is specifically murder. In KJV it is understood to mean murder but most of the things stated then were completely differently phrased; it is an error of time lapsing not an error of scribes. In the Torah it is the same http://www.jewfaq.org/10.htm