Why is group messaging allowed for regular users?

Here you can find useful information about the KCNR website.
Why is group messaging allowed for regular users? Here's some spam sent to "Donators" group in the last few days:

Image

Image
How is this spam?
These are not regular users. Crazyboy is a donator, BannanaVodka is a Hall of Famer/Ex-Admin. These group messages are moderated however, and users WILL be warned if they abuse it. Thanks for your concern though... (I guess :/)
phpbb is sucky on this one. To allow multiple user messaging you must allow group messaging.. its all one option.
Kar wrote:phpbb is sucky on this one. To allow multiple user messaging you must allow group messaging.. its all one option.
Each permissions object (user, or group) has 2 options to control it:
Image

You'll need to be using the Advanced Permissions to see this options however.
lol i m Donor i just sent once a msg to all donor a long time before
i was testing