So that's like the power not the person. That PC didn't choose to be a Chaos Sorcerer. He was born one. You are just as likely to have a LG Chaos Sorcerer as a chaotic one.
Sure, the person who plays the Chaos sorcerer and focuses on the phrasing "unpredictable power" is going to choose to be lawful.
Deny it as you want, there is a lot of emphasis on them being chaotic more than lawful
Stealing power is not good, but it's also not inherently chaotic. As for Feylocks. Congrats! You've just shown that Warlocks can choose to be chaotic like anyone else, not that they are predisposed to that alignment.
Stealing power is also not Lawful, which was more the point.
Well, you've moved back on one of them at least. But again, see that Sorcerers are born with their power. They don't choose it, so that one chaotic bloodline has no bearing on alignment and the others don't even have that small connection to chaos.
Storm Sorcerer? They'd be fairly chaotic. And again, being born with chaotic power and having "obscure motivations" tends them towards chaos more than towards law.
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My sympathy for a GM who (i) runs a game that can't progress unless the players have information X, and (ii) uses his/her power over the fiction (in this case, NPCs) to make sure the players don't get that information, and then (iii) complains when the players declare actions for their PC that they think might force the GM's hand in respect of that fiction: ZERO.
What you're describing sounds like the quintessence of all bad railroads and GM beatsticks I've ever heard of bundled together into one terrible combination.
In perfect fairness, I suspect they are trying to play the NPCs as "realistic" and that the players will just give up and proceed in blind. But, going in blind isn't what any player is going to do.
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Well I dont agree with this. There are no good assassins'. If your first and foremost method of problem solving is murder, you are not a good person. Everyone tries to justify evil actions as a good thing, as opposed to just being an evil person who isnt a total dink. Evil doesnt mean you kid every puppy and steal every baby's candy. Though, this is a classic alignment argument that really took hold after the common "no evil" houserule came about.
You may not agree with it, but those are exactly the sort of blanket statements that cause these issues.
Because what are player character's if not assassins, hired to go and kill problems for the area?