I don't think he should be banned. Yes, it was a regrettable and deeply stupid maneuver, but I don't think for a second it was a really dangerous move. Seb is a 4-times world champion and knows perfectly how to bang wheels at low speeds without causing damage to the cars. This is a matter of ethics and of whether someone with so many titles to their name should be driving like a hot-headed teenager, but I don't think there are safety grounds that warrant a race ban for him.

As a reminder, Pastor Maldonado did something much worse during qualifying at a Belgian GP and didn't get a race ban either.