Windrunner

I've read Shadows for Silence several different times and actually wrote the article for the Evil on the Coppermind. As far as I am aware, there is no mention that the Evil came from the sky in the story itself or in any interview questions.

What you've asked is kind of a complex question, that we don't have enough information to fully answer. I can give it a shot though. Firstly, it is important to note that Shards don't just act in accordance with their intent, they also sometimes will aid or encourage others to follow it as well. For instance, Ruin's manipulations leading to the fall of the Final Empire or his absolute control of Marsh. Another caveat is that every Shard's intent is interpreted by its Vessel, so the precise definition of "Ruin" to one Vessel might slightly differ than how someone else might interpret it. It is also important to note that the intent becomes more difficult to resist with time. This is why Vin was able to kill Ruin with Preservation's power, he had held it for only a few hours, she could still resist the desire to only Preserve. Also, we really do not know how difficult it is to "kill" another Shard. Odium manages it pretty effectively but we have it confirmed that it is still taxing for him. It took Ruin millennia to actually kill Preservation. Now, lets break down the known Shards.
Ruin: Ruin, as you said, is pretty straightforward. He destroyed an entire planet, and its system of government, also created an essentially global war, killing most of that planet's populace.
Preservation: While it may not be noticeable immediately, Preservation was rather successful as well, maybe even more so than Ruin. He managed to create a plan that ultimately saved the remnants of humanity on Scadrial and led to the creation of a planet that was more or less just as it was before The Lord Ruler wrecked it all.
Devotion: Devotion is dead, so its hard to say much about what she was like in the past. The Shard is inactive, so we can't see how she would have acted. Looking at her Perpendicularity though, the Pool shows its Devotion when Raoden is thrown in, he can feel its love and sorrow for him.
Dominion: He is in a similar situation to Devotion. However, the skaze, presumed Splinters of Dominion, have heavy influence in the Fjordell Empire, which is above all concerned with dominating all of the world with their religion, forging a global empire.
Endowment: All Endowment does is give, every single person born on her planet is given a Breath (which is confirmed to be more Investiture than people born on planets without Shards get). She also manages the Returned, giving them all the divine Breath, a Splinter, and an opportunity to Return to Nalthis.
Honor: Honor is dead as well, but it has been mentioned several times that Honor has a lot to do with oaths and promises. The Oathpact, forged between the Heralds and Honor is a clear example of Honor obeying his intent. Although we have less information here, I suspect that Honor's agreement with Odium in which Odium was trapped is a similar thing.
Cultivation: Cultivation is one where it is difficult to tell. I see no real instances of her helping things to grow, but then we haven't really seen Cultivation. Dalinar should be meeting the Nightwatcher in his Oathbringer flashbacks, and the Nightwatcher is heavily related to Cultivation, so I will reserve my judgement on this one for now.
Odium: We also have seen little of Odium. However, the overriding theme with the Voidbringers is there hatred, so I suspect that we'll continue to see more hatred from Odium as time goes on.
Autonomy: Likely the named Shard that we know the least about. He's alone in his system, but we're going to have to wait for White Sand to really make a call on him.
Hopefully, this was at least a little bit helpful. It can be subtle, but every Shard acts in accordance with its intent and influences others to do so.