Wouldn't it be nice
It's risky to speculate on alien behavior, but my guess is that ETI will realize that there is much more to be gained by peace than by war. That is not to say that they wouldn't waste us in a heartbeat if they felt we were a threat.
Unaggressive and docile species probably would never have scrambled to the top of the evolutionary heap on their own planet. On the other hand, tough guy bully-boy races would probably have not long survived in a galaxy filled with plenty of big guns.