Keir Starmer has condemned Zack Polanski as “disgraceful” and unfit to head a political party after the Greens’ leader shared a social media post critical of the way police tackled the suspect in the Golders Green stabbings.The prime minister said any criticism of the police involved in the arrest was unfair on officers having to make split-second decisions in a moment of potentially grave danger.Police were filmed detaining the suspect after two Jewish people were stabbed in the north-west London suburb on Wednesday. Footage of the arrest shared on social media shows two officers appearing to kick the man on...