>has no motive for his aggression? then yes, i consider that
>irrational.


No. My contention (along with the man quoted above) is that there is no way you can successfully explain to the aggressor why he should stop aggressing in purely reasonable terms. He could be the MOST reasonable person in the world, and still there is NO REASON why he must stop hitting you.....

.....
.....

UNLESS....

There is a real, objective (meaning God-given) moral law among humans. Note, the presence of said law does not mean that he'll stop hitting you... obviously. The point is that its (the moral LAW's) presence is the ONLY thing that could make an appeal to his "reason" valid.

If there is no God... ALL is permissable.

peace.