This. I feel people are being too hard on Vanya and not hard enough on Reginald. The guy wasn't only a cold and distant father, he was downright abusive. Next to him, Michael Jackson's dad looks like a good father. What he did to Klaus and Vanya specially, was horrible! Heck, he wouldn't even address his children by their names! In fact, they didn't explain it, but I think the children gave themselves those names when they grew up, that's why Five has no name. And then he thinks they're going to save the world when they grow up? No thanks to you, asshole!
She was 4!! She didn't "murdered" 3 nannies, she didn't know what killing was. She just knew she didn't want her oatmeal. If indeed the nannies were dying, then Reginald is truly a monster, since all he did was get another nanny to get killed before he finally tried with a robot. He didn't even care that the nannies were dying. No talking to her and explaining what the consequences of her actions were, no parenting at all. How did he pretend she'd learn anything? The only thing he tried was attempt to train her like a professional athlete or a dog. Also, the kid was a toddler, let her NOT eat her oatmeal if she hated it that much and find something else that she prefered. That's not the hill you want to die on. But nope, he'd rather have 3 employees killed before not having one of his kids do exactly what he wanted them to do.
Exactly, he just decided to lock her up and when he found he could just sedate her, what does he do? Mistreat, ignore and psychologically abuse the poor child. Sure, you have a super powerful kid who you're afraid of and your solution is to raise them with as much resentment as possible, so one day they finally snap. That's smart.... Also, no matter how many pills he made her take, that plan was stupid, cause if she's that powerful (she blew up the fucking moon, yo!!!) one day she was bound to explode anyway. Heck, she could have just forgotten to take the pills or lose them and all Hell would break loose, since she couldn't control her powers and didn't even know the extension of them thanks to stupid Reginald. Making her believe she didn't have any powers was one thing, and may not have been the smartest decision, but I could understand that. But he not only did that, he belittled her and made her feel like shit every day of her life. He made her feel jealous of his powerful siblings. He made her feel like an outsider. He made her feel unimportant. He made her YEARN for powers. It's like he purposely wanted her to blow up one day.
And speaking of stupid....Luther is the one who actually caused the Apocalipse. Vanya felt horrible about what she did to Alyson, they could have worked together to help her control her powers. Maybe she would have continued taking the pills voluntarily if she knew she couldn't control them. But nope, he knows his sister is so powerful that she could blow up and cause the END OF THE WORLD, and what does he do? He makes sure to piss off said super powerful human to the point where she actually blows up. What did he think was going to happen when he locked her up in that horrible room (did you see the knives on the walls?) to wither and die?
And the siblings may not have been guilty for what Reginald did, but I can see why Vanya would resent them as well, and not just be jealous of their powers. They also belittled her at every opportunity as we saw in the last episode. We actually saw it since episode 1. They continuously ignore her, like she's not part of the family. They never told her anything and made decisions without her. Diego is downright nasty with her, Alyson was also very cruel to her on several ocassions, and she's supposed to be the one closer to her. Luther pretty much ignored her. I don't know, if you see one of your siblings being mistreated even much more than you are, you kind of try to reach out to them.
Also, I liked Pogo.... until we discovered he was covering all the fucked up things Reginald did. I'm not going to blame him for not doing anything about it, after all, he was just a victim as well. But after Reginald's death, he continued to keep secrets, when the knowledge of said secrets could have saved a lot of time and made things easier for the siblings. He also continued to justified and defend Reginald for all the horrible things he did. I suspect that's some Stockholm Syndrome on his part. But yeah, I'm not that sad he's dead, turns out he was kind of useless at the end.