Morgan is someone who is dead convinced that she is, fundamentally, evil. That is wrong and stupid. Obviously. She only believes that as a way to rationalize her suffering- if she is evil, then she deserved all the bad things that have happened to her, and the world is fair. Sakura behavior.
Now you might be tempted to say that Morgan is a good person. However, that would also be wrong and stupid. For all Morgan is wrong about herself, she is right in constantly emphasizing that she is ultimately of the same origin as her phh self. Her profile mentions that multiple times too.
Morgan isn't good, and neither is she evil. Morgan is someone who wants. She wants one very specific thing more than anything in the world. She wants a home at any given cost. And for that end she would be the most wretched of witches, the holiest of saviors, so long as she can have somewhere to belong to. She doesn't want a kingdom to rule, she would have been perfectly fine with Mab taking the throne from her. She doesn't even necessarily wants to be alive in here. She just. Wants a home. That ship sailed in phh history when Saber brought in the age of man and chased the witches back to the reverse side of the world, but that lostbelt was her one shot. That's why phh Morgan is willing to kill herself for that home. That's why Morgan does ALl This Shit. She wants somewhere to belong to. And if the world will reject her at every turn then she will just stop asking and carve her own place in here by force. The only reason she's so vindicative about it is because the one time she tried to delegate to someone else Uther got himself murdered within the hour so she just concluded that if she wants shit done she better buckle up and od it herself.