You are mistaken, it isn't mandatory, there is a choice between English and German!
I had a choice between Spanish and French =////

anyway, yes, from the logs you can tell he was deliberately abusing the bug. but i bet a good amt of the people that stole bitcoins won't even reply/disappear. so, the offer of 20% at least shows something. i think something like 50% would be even better though, this way you still make bitcoins and inaba gets his back faster!