So how could i blame them since i would have done the same t

since是连词,引导原因状语从句,从句从语意上类似个条件状语,If I had been in their position,I would have done the same thing.(如果我处在他们的位置,我也会做同样的事.)对过去的虚拟语气,（假设条件成立的意思）主句用过去完成（had done）,从句用情态动词could,should,would或might加现在完成（have done）
翻译：因为我也有可能做出他们做出的同样的事,那么我怎么能去责备他们呢?