@Qelix
Probably because this story shows why.
- dragon slayer wants to kill fmc
- MC stops her
- MC and fmc spare her
- DS instead tries to kill FMC
- MC shields FMC
- MC gone
- FMC rampages for years in her grief
- DS survives and avoids facing responsibility of what she caused
- finds MC and immediately uses him as bait to plot killing FMC again
- thus repeating exactly what caused all of this
That's why people are siding with FMC who is acting on emotions rather than using her mind like DS does.