Sentence:  ..Karius was a danger to his own team, <WSD>responsible</WSD> for Madrid's two other goals and last seen wandering aimlessly around the pitch – alone, distraught and clearly traumatised – to ask forgiveness, hands clasped, from the thousands of Liverpool supporters. 
Meaning of the word marked with <WSD> tags:  Being a primary cause of a situation or action and thus able to blamed or credited for it.