I think that the problem with agents in MEPBM, is that in
most cases, there
is no effective defense against them. There is nothing that
a military
nation can do to stop the agents from emptying his
treasury, killing all his
characters, poofing his armies.
It's difficult enough in the real world for a country like the US
to know where foreign agents are, even with all their technology
and manpower, so how do you expect Middle Earth nations to cope?
After all, just look at the difficulties the US is having with
Al Qaida and their ilk...
Gavin