Look, it's absolutely unacceptable to be coming to someone's family home and threatening them, especially when they've got a wife and kids inside. He's only a human being and he's got a family to protect. I hope there's a quick investigation to identify these louts and punish them.
That being said, the conspiracy theorist in me says that it's also well within the realms of posibility for this to be staged, in order to quell the the unrest against him and the club. It seems a bit odd to me that you've got some guy snapchatting the event tagging it as 'Ed Woodward's gonna die tonight', then fairly meekly throwing a few flares at the house. In hope of what, to accidently burn someone's house down?.
This is a guy who's got a plumb job earning millions of pounds per year - he won't want to give that up too easy. You'd know that any event like this would be almost universally condemned as well, and that club seem to be regularly trying to manipulate public opinion about them.