I don't know, if I'm the alien in this scenario and could plainly see they don't have the ability to traverse interstellar distances I wouldn't be concerned from a personal safety stand point about making first contact with the intelligent life on a distant planet even if they did show they still had problems with conflict. I'm obviously projecting my own assumptions based on living on Earth but, on Earth inter and intra species conflicts naturally occurr across the kingdoms of life (maybe even all of them?) so it's doesn't seem that unusual.

Maybe if life, and intelligent life particularly, is common and perhaps intelligent civilizations commonly eventually figure out how to avoid conflict, I wouldn't be presumptuous and judgemental because this particular one hadn't got that far yet. It would seem that's something they likely all have to go through and that's just operating on the arbitrary assumption that civilizations somehow do tend to figure out a way to overcome conflict, it could just as well be that they typically don't given how hard it seems to be, so the would be aliens here likely have or have had conflicts of their own.