を責めないで

don't blame

→ を
phrase Rare #42,729
don't blame を marks the person or thing being blamed. The phrase can be followed by よ for emphasis or ください to make the request more polite.
JA: 失敗したことで彼を責めないで。
EN: Don't blame him for the mistake.

子供たちを責めないで!

Don't blame the children!

ガイドさんを責めないでよ。

Don't blame the guide.

遅れても私を責めないで下さい

Please don't blame me if I'm late.

— ラスト、コーション (2007)