Let's see,
1/ Did not want to do a heavy weight, fully laden with fuel, landing with a blown tire.
2/ No other damage, so no immediate need to land.
3/ Crew did not know it was blown. Unable to link, so the answer to this one maybe in link
4/ Having had a blown tire, I can assure you landing at normal weight at the destination is better than a heavy weight landing at the departure point. Yes, they might have been able to dump fuel, but what for?