Follow that line though and you're accepting that bikes shouldn't be on the road because they hold cars up.
How often have you been overtaken impatiently, only to pass the same car a couple of minutes later? It happens to me a couple of times a week at least.
And as to the 'causing danger' bit, Mag hasn't caused anyone any danger. He didn't make the driver do anything. In the same way that cyclists don't cause heart attacks in drivers, they don't make them choose to carry out dangerous manoeuvres like the one in the vid.
What makes you assume,i say ASSUME

that i accept your rediculous statement that bikes shouldnt be on the roads?Its about being sensible and courtious to other road users,i dont know about you,well i probably do,but i would have been straight into secondary off that rb,and if i hadnt i would have expected somesort of reaction from drivers im holding up for nothing.
Mag has caused that situation because he held his obstruction too early for too long,he knows how cars react to that,just think back to all his troubles because of his riding style and report techniques,it says a lot to what his cycling style is like for others.