If you say that you do not blame someone for doing something, you mean that you consider it was a reasonable thing to do in the circumstances.
责怪 A bad workman blames his tools.
The blame for something bad that has happened is the responsibility for causing it or letting it happen.
(事故、过失等的) 责任 Nothing could relieve my terrible sense of blame. 没什么能把我从极度自责中解脱出来。