Hi theymos
-The BTCs owners could be very sad, because panic could trigger a drop in the FRN/BTC exchange ratio, triggering evaporation of purchasing power of their BTCs, e.g. their BTCs can buy much less goods and services than before the attack.
The attacker must hold a large amount of BTC in order to execute the attack. So he'll also be affected by the lower price. If he brings the price of BTC to 0, then his attack was pointless, since the money that he got back is now worthless.
I'm sorry but I don't understand your argument. The goal of the attacker is to harvest goods/services and have 0 BTCs at the end of the attack, but be plenty of goods/services. The attacker will therefore not suffer from the FRN/BTC ratio plummeting because of panic triggered when the the community realizes to have been hacked, which is after the attack is completed. I hope you agree with me.