She's evil, like all murderers.
Her victims did not deserve to be murdered.
It is still a fact that her in-laws en masse had sought and accepted large amounts of money from her (from her personal inheritances from her own family) and that her husband, in particular, had manipulated her into putting property in his name, dangling the carrot of a possible reconciliation as an enticement.
Just because he was a probable victim of her earlier poisoning ventures, and just because he lost his parents and aunt to her murder plot, does not make him a good man.
Just because these poor people were murder victims, were Christian, or tried to "stay on good terms" with Patterson does not mean that, as a whole, her husband's family had treated her with love or respect. She was financially rinsed, humoured, manipulated. If you read the court files carefully, you'll begin to see why she festered with the kind of sullen resentment that, in a twisted mind like hers, became a justification for murder.
It isn't victim-blaming to recognise that human characters are complex. As it emerged at trial, not much about this wider family set-up was very healthy at all.
I feel for her kids who by all accounts still support and believe in her. Their father has not been on good terms with them for some time, their grandparents are dead, and they must feel so cast adrift now.