Wow I suppose he did it at least twice then. I would seriously question the character of any person who regularly carries out fifty one percent attacks against altcoins because he does not agree with them. It really is terrible behavior.
Coil Coin was actually a merged mined coin, which have notoriously bad security. Namecoin being a more well known example of this. It was a conventional fifty one percent attack and the project was simply abandoned. I think people just did not want it to live badly enough, it did not have much going for it to be honest, which lead to an extremely low level of security not to mention that this was a merged mined coin as well which tends to have terrible game theory security. I do not think that the first chain fork of Bitcoin would encounter such problems, at least its security will not be able to be overcome with such impunity, and our wills not as easily broken.
So again, I do think my point still stands.
It is funny technically you might even be able to argue that Coil Coin is still alive, even though it has been abandoned by its developers and it lives in obscurity, it only takes a few nodes to keep the blockchain running and it is. There are even some people showing interest in using Coil Coin for some gaming guilds tokens. It is amazing how resilient these cryptocurrencies really are.