I agree with pcsurgeon, it's completely ridiculous.
I now completely ignore the defense side of this game. There is no point. I make sure there are points to be gained there (so attackers are happy), but the run on PvP points to get medals is madness. People play autoplay all the time to get through the neighbourhood in a day. Where's the play in that? All players have the same result with the same player they attack! I only attack the map now (which DOES have the attackbonus for defence) and that's it. I'll gather my meds slower, but no ridiculous ratrace.
2 measures must be taken:
1. reinstate attackbonus for defence (if not for the full 100% strength, then for maybe 50% of the level reached in GB)
2. ban autoplay.