And why did they think he was the bad guy? He wasn't armed and he wasn't even Arab. They simply assumed he must me bad because he was black. I mean, there was ten white people wounded on the ground that didnt get mobbed.
The fact is, they thought he was the bad guy because the xenophobic nationalism in Israel has gotten to the point that see anyone who looks remotely different as "the enemy" now. Black people are the enemy. Hispanics are the enemy. Asians are the enemy. Fucking Europe is the enemy. To them, literally even non-Jew on the planet with the possible exception of white people in the US and Canada are the enemy.