Should Vettel be banned?

[The Black Knight]

Lewis did play his role , Mia , but Seb was right to say it was his own fault .
Lewis didn't react to Seb being closer on the second restart , but it was not his role to do so .

I'd guess Vettel expected him to do so , and thus , was caught out .
A silly error , and an improper assumption led to a dumb move .

Exactly what role did Lewis play apart from being in the lead of the race and doing exactly as any other driver, including Vettel, might have done?