If there was another Heartbleed, SSL or DNS vurn, in which core libraries or services were suddenly open to exploitation, would it be feasible for remote attackers to steal funds from LN hubs? If not, why not? If yes, why do you not think this is a deal breaker?

This is my biggest concern with LN right now. It appears to be a very risky venture with little economic incentive. Currently there's no risking btc running a node with no wallet, and these nodes relay transactions just fine. but there appears to be large risk in the loss of others funds for running a hub, with little reward.

But if these hubs are to have control of funds, how are the keys protected when and if there is hacking involved?

EDIT - To those who think im attacking LN, im not. Chill out. I love the concept and im all for it. You want to walk blind into a smoking house by all means do it, but I prefer to educate myself on the facts before walking into the house that might set me on fire.