In addition, certain classes of attack will cause the attacker's stake to be automatically forfeit via slashing. So in that case not only is the wealth of the a

In addition, certain classes of attack will cause the attacker's stake to be automatically forfeit via slashing. So in that case not only is the wealth of the attacker obliterated, but their stake itself is destroyed and the network can continue onward as if their stake never existed. In such a situation, the price effect of the negative news from the attack would be partially canceled out by the jarring reduction in ETH supply.