It appears that Macron was isolated at the EU summit. He wanted the UK out as soon as possible, everybody else was arguing for a longer extension. October is a compromise. Macron says an immediate no-deal Brexit is preferable to the damage to the EU (’importing a British political problem to the EU’) which would be caused by continuing uncertainty.
This is intolerable! Hopefully, Nigel Farage and the other Euroscecptics can destroy the EU from within while the Brexiteers work on ousting Europhile MPs in Londonstain.