Let’s see what Hinduism says :
It doesn’t talk about Sati.if anybody had performed , it has been out of pure will.
Sulochana throws herself in the fire when meghnath dies-voluntarily. It was because she couldn’t have lived without him.
Tara -the monkey queen -remarries her brother in law -that is widow remarriage .
Kunti is all welcome at Hastinapur (her marital home) .
You have to know that till the early Vedic period women held an important position in the society. They were educated , were somebody without whom rituals were incomplete. They learnt hymns and bhajans to recite them in public . When swaymvars were conducted there wish was the most important. Kunti selected Pandu because she wanted it. Remember: exceptions have been popular and exaggerated.
Now coming to this
They are a bunch of incompetent people. Even if somebody felt another way -they would be termed as anti-societal.
It has been the only way to exert your dominance on the society.
I guess the marriage should have at least shown something worth to show sati. Cause these people are looking , extremely evil.
The Sharda act comes in 1929 , and sati would be banned in the coming 20 years ( according to the serial )