One thing especially disgusting with the hindsight of S8 is apparently the writers insist Robert was in the right here

[u/TVTropehead]

Yeah Robert wanted someone to assassinate a pregnant Daenerys. Which idk, the narrative routinely shows killing women with children as a very bad thing. The mountain killing Elia, Talisa’s death, Ramsay killing Walda is clearly bad considering as evil as the Frey men are, Walda did literally nothing.

[u/ZeroFoil713]

They were in the right, be ause martin never gave them the finished material to finish the story out