Let's begin with something far too many seem to overlook. The vastness and diversity of our universe.
There are too many planets to put a number to that support life. Our solar system and those closest to us are a poor representation of what other parts of this galaxy and others in terms of the amount of life they hold.
When approaching a race, such as humans, visitors from another star system tend to introduce themselves as being from that star system. If this were humans visiting another galaxy, they would say "We are from The Milky Way" and those we visit may say we are something like "Milky Wayan".
However we all know there is more to it than that. Perhaps you are Caucasian, from Brooklyn, and you're Catholic. All of these would be different than say, someone from China who happens to be Buddhist. Each of these people would have different experiences, beliefs and perspectives.
We cannot assume other planets are any different in this regard.
What if you were a Mars colonist, black, and Jewish and you visited another planet in another Galaxy. You would have a totally different story to tell the world you are visiting.
Beings from Andromeda visiting earth calling themselves Andromedans is too unspecific as an example. There could be millions of planets and races from Andromeda in theory.
We also tend to describe ETs in terms of looks. Greys being the most common. There are literally millions of different "Greys" groups. "Tall Whites" or "Tall Blondes"/ Nordics are also not talking about a race or group, but rather an ET body type, like saying "Human".
Even the name Human is widely used. Humans come in several varieties even in relation to individual planets. There have been many variations of Earth Human throughout Earth history.
Religions exist on other planets, governments and currencies. Planets at different stages of development with different preferences and cultures. Everything we see here multiplied.
The assumption that because a race has acquired the ability to travel the Galaxy and make contact with other worlds are more advanced in ways of morality, is false. It does not mean they have figured out everything. Some have very odd and/or twisted beliefs.
The diversity is astounding. The variety would surprise most who have been following UFO research over the years.
There are few that are of like mind. Those that are of like mind are mostly hive-mind races, but some are not and have merely found a way to work as a collective. For the most part however few races all agree with each other on everything regardless of how they are governed or organized.
Which means.. Some are nice. Some are not so nice. Some seem nice and are not. Some seem like they are not but they are.
There is no magical utopia over the rainbow completely untouched by the light and the dark. Some planets are damn close, sure. The Universe has a funny tendency to wobble for a while to then restore balance again. It seems to promote growth, but I cannot speak for the Universe of course.
We can go to space. We are much more capable of traveling and existing off planet than most know. We are not a united planet all of like mind, or enlightened, or highly evolved, as we tend to expect other races from other planets to be.
This can be hard to accept. No race has "figured it all out". As above so below. Some things they know about, obviously, but not everything. Some can even overlook or cannot make sense of things that seem simple to us.
People on this planet have figured out many things that are not commonly accepted by the majority. The majority has accepted things that are incorrect as well. Yet if we were somehow to magically eliminate all the contradictions and find the roots of our collective knowledge, we would see we have much more figured out than we realize.
The same can be said for races all over the universe as a whole. This is a process and all planets are at different stages, but the process, is long from complete.