Coexistence with other Intelligent Species

While co-existence with other sentient, intelligent species may be somewhat possible, we have to consider the simple fact that even as a single species, we're divided beyond repair. Not just by the expected such as race, sex and sexuality but borders, place of origin, language, intelligence, simply whatever you can think of. Coexistence may be POSSIBLE, however is it worth it? 1. Constant in-fighting. For this point, I'll be taking bringing the very recent and relevant topic, Trump. An entire country is divided half and half just fighting over who it is that signs papers. Why this is important is because the US presidents don't serve much purpose other than being a spiritual leader. Even without a president the government could function just fine. This is what comes to mind, let's say we have 2 species and somehow, magically all other conflicts got resolved. There is only just a slight tinge of xenophobia from let's say 10% of each species. If one species' ambassador was a tad too friendly, this 10% can quite easily march for revolution. A well-known case of a minority rising up from basically nothing to leading a nation would probably have to be Hitler's rise to power. There is also the fact, that conquests and genocides are always sparked against people that seem 'alien' to us. In this case, that would quite literally be what is happening. 2. Resource Wars. We most likely will share resources we need, as we have not found evidence of anything but carbon-based lifeforms. I'm going to disregard artificial/robotic species as we would most likely try to destroy or salvage their brethren for technology, upsetting them heavily and sparking a war (If they have the same values as us, which they would probably do to have curiosity). We'd have to share resources, and what if we have an abundance of wheat, while their home-planet has a lot of oil? Well, we'll simply make trade, right? That is quite right, however if we look at trading through history, all of them collapsed because one side simply got greedy. None of us are immortal, and thus one moronic leader is enough to destroy the entire relationship over greed. (Once again, greed is a necessity for curiosity) 3. They're not like us. All of what I previously stated have been going on with the idea that we share the same mindset as them. However, that won't be the case. The only thing they need is curiosity, and aside from that we can be entirely different. They may be absolute xenophobes or may be peace-loving animals who do not realize we are using them. They could enslave us, for whatever reason. Steal our resources and those of our solar system. They could simply be looking to mindlessly expand like an artificial race would, maybe even making every planet inhabitable just to keep biological races from having it. Other species are absolute wildcards, as we have not been able to observe any other evolutionary path that isn't our own. Did you know that multiple animals on earth kiss each-other to show affection, not just us? 4. Us. We're an idiotic race, very much in their infancy. War is absolutely inevitable and until we are able to have a single nation be stable and not collapse after 1000 years, then we're ready to make contact. Until then, we're better off alone.