Sorry if I sound rude or something Hieral, not my intention, but you don't know what a DDoS attack is. There's hardly anything SE (or anyone, really) can do to defend against a DDoS atack. That's why it's such a popular tool to disrupt online services, because it's almost impossible to defend against it. The only real way to fight it is getting more resources so they don't get saturated by the DDoS... but if you do that, the attackers can just get more resources (usually more people) and that's it, you're back to the start and your service is still disrupted.

It's unfortunate that some people can't seem to get a life and do this kind of thing, but no amount of extra "security nerds" will do anything to help here. We have to be patient for the time being. I'm sure SE is trying to figure out something to fight this but in the mean time, patience. It's not like it's SE DDoSing their own game.