If ETs are able to travel around the Galaxy at faster than light speed that means that they have have the ability to harness absolutely enormous amounts of energy. Probably each Extra Terrestrial ship has multiple Tsar bombs worth of energy at their disposal. Their society must have developed some sort of maturity to make war and violence obsolete, much like World War has become less prevalent with the advent of the atomic age or they would have annihilated themselves early on.
Totally agree on this point. I mean, if we could as humans as a race come together and figure out how to live on this planet together, imagine what we could do.
Also good point to remember is maybe the aliens are nothing like we imagine they are, maybe they are already here and we just as a agreed collective don't yet have the capacity to sense this. There are many stories of people communicating with ETs already, if people did some research and had the capacity to understand more of the spiritual nature of things we would already see this on a global scale I believe.
> Their society must have developed some sort of maturity to make war and violence obsolete
Why "must?" That just sounds like an assumption based on what you want to be true. It is just as likely that a civilization you describe exists but has the exact same type and frequency of internal squabbles that humans do.
With that much power, "internal squabbles" equals mutual annihilation. Just imagine if terrorists could easily make their own thermonuclear weapon etc.