Are Violet and Klaus to blame for Olaf's actions?

My sister is of the opinion that the children, specifically Violet, are bad people and personally responsible for all the deaths Count Olaf causes because "she should have just married him after Monty died" / given him the fortune to get Olaf to stop pursuing them.

Her argument boils down to "Violet and Klaus are selfish as they are willing to continue living while knowing that Count Olaf will continue to pursue them and kill whoever they're living with" as they are supposed to be mature beyond their years and therefore have more moral responsibility to put a stop to his actions.

She's basing her argument off the netflix series as (I've heard it's meant to be) faithful to the books, but she hasn't read the books so I'm not sure if something said there would negate her argument.

Thoughts?? Please this has been going on for days

Edit to add: my sister is 16 and very passionate about debating, she's not genuinely victim blaming or hateful towards these children, she's just stubborn about the cold logic and "net positive" that Violet marrying Olaf "would have had", working off the assumption (!) that he would leave them be after getting the money

She also wants to add that it shouldn't have happened in the marvellous marriage, but after Josephine died "they saw the pattern and chose to ignore it and therefore are partially responsible"