They are basically a horde of geeks with nothing better to do than crack the system.
There is an entire warbot community, including Clan FiSh, WaR, and a few others, that do nothing other than war random clans for
**** and giggles.
You can either try to do a CMK approach and ban them, set the channel to private, or ignore them.
If you are using a StealthBot, you can easily filter
**** from them by doing "/block *@Europe" and making sure Chat Filtering is enabled, via Ctrl+F or Window -> Use Chat Filtering.