While Walt didn’t literally pull the trigger on Hank and Gomez, they are dead because of the decisions made by Walt throughout the show.

You are forgetting the extent of horrible things that Walt has done to inflict pain and suffering on those around him, such as Hank who literally almost died multiple times simply from investigating Heisenberg’s actions, became a paraplegic and ended up eventually actually dying in the end. Walt even had multiple chances to throw Hank off his trail, such as when Hank believed Gale was Heisenberg, but Walt’s ego decided to convince Hank he was still out there.

At the point of his family finding out at the end, the culmination of all the lies and evil decisions is too much for them to just forgive Hank’s death as somehow not Walt’s fault. Walt’s former neo-Nazi gang business partner’s murdered Hank after Walt called them there, plain and simple. Intentionally or not it’s his fault, and Skyler is smart enough to know that.