The break the alliance button just behind the name of the fam you allied is a wrong place imo:

[16:01] <Lee> Break the alliance.
[16:01] <Lee> iv nearly clicked that so many times
[16:01] <Lee> one day it might happen
[16:01] <@Booya> yeah to read the forum
[16:01] <Lee> yep
[16:01] <@Booya> i've almost did it as well

Either get the button somewhere else or when you click it make an additional screen pop up whether or not you really want to break the alliance (dunno if this is allready there though and too afraid to try )