I've Posted on the Same Topic
I had the same feeling when cw started and posted a similar thread. A valid point was made that adding defence donations to your total donations and achievement donations could result in players mass donating giants to improve their donation stats and get achievements more quickly. In normal chats we can usually monitor this using the reporting of who donated when they donate. However, when donating defece troops in cw, there's no notification of who donates what, so there's no way to police it. Until that is changed, it's probably better that defence donations don't count.