"We would be to blame"
"We ourselves, would be to blame."
The latter sentence emphasises that the people being spoken about are specifically to be held responsible.
For example, if the Prime Minister were speaking to his cabinet about an issue of international conflict, he could say:
"If the outcome of these negotiations is war, and as a nation, we begin a conflict, then we would be to blame". He might be speaking of the Government, or the country in general, as a rule of thumb.
However, if he were to say:
"If the outcome of these negotiations is war, and as a Government, we begin a conflict, then we ourselves, would be to blame".
This is not an entirely perfect illustration, but it's only to try to differentiate the two for you.
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