One thing is a 51% hashpower attack. Another thing is a (hard)fork. You don't need to control 51% or more of the network to do a hardfork of a coin. You can do it yourself, but it's up to the other people to accept these changes. Part of people can accept and other can't accept, and in this way you would have 2 versions of the coin running independently (and also incompatible). They could just stay at the original version or tried another scheme more compatible with the rythm of the first hours.

Of course, they did it wrong, and this is why I dislike Dash, but creating another topic about this, claimiing the police should be called and other things like this doesn't help in any way. Even worse, a state intervention in this could create a very very bad precedent for other cryptocurrencies (including the legit ones).

Edit: just removing the quotes. They are unnecessary.