As an NF myself I was here seriously contemplating how an ENFp would be content with all this talk of violence, force etc coming across from ISTp types or maybe it is just a few on this forum. I feel a bad conclusion coming on.
Hm...my ex was interested in military stuff, but more from an engineering point of view (air planes and such). On the other hand he was quite the pacifist actually and a liberal and he was not openly aggressive. I could never ever in my life be with someone who blows up easily or is easily offended and gets aggressive (the very idea gives me goose bumps). This is not to say that ISTps are like that. Are they?

But it really seems as if ISTps generally have this huge fascination with violence and military and it seems as if ENFps absolutey cannot relate to this...

I don't think it's about balance, but perhaps you can explain what you mean.