I don't have enough details on how this instamine went because I was not attached to this coin at that moment. So it wouldn't be fair for me to call it a blatant scam.
But I wonder what stopped him from relaunching the coin fairly to make things right - and this was a very big reason to relaunch.
So i'm voting for 3rd option:
It was an accident, but it worked out well for him. No regrets.
The funny thing is that, instead of crying all bitcointalk, anyone can relaunch the coin NOW and do it better than Dash! The code is open source!
For some people is easier crying, fudding and trolling instead of doing some work for themselves.