Blonsky mutated himself into the Abomination, Ross didn't force him into it. Ross isn't culpable. Plus seeing how Ross got made into the Secretary of State most likely his actions were covered up by his friends and political connections, meaning there's the chance the Avengers wouldn't have known 100% of his involvement.
So yeah, not relevant.
Yes, Ross is culpable. He was the one who gave Blonsky the initial serum before the incident at Culver University. In fact, he had suggested that the other man take it. Blonsky took it even further and had himself injected with Banner's blood. And in the one-shot story, "The Consultant", Ross and the WSC wanted to include Blonsky on Fury's new Avengers team. They went as far as to blame Bruce for the destruction of Harlem, so that Blonsky would be considered.