Translation of "Kryptonite" in Japanese

Are my kryptonite.

私の弱点以外の何物でもありません

I suppose, for me, spit was kryptonite.

唾を吐かれて 私の力は奪われたのでしょう

This image is the kryptonite for extremists.

こんな光景が 過激派の力を奪うのです