I wan't to express, that I disliked Rick and Morty season 3

[Homeless Nutter]

About that. I remembered in the first episode with the citadel. There Rick calls the council hypocrites, because they themselves created a government so that they can hide from another government. Well, unless they said that it's impossible for any good  government to exist they're not hypocrites, at least not in this scenario. To me it seems like the show it's implying (maybe not intentionally) that the sole existence of a government or any authority figure is bad and that anarchy is the answer, which believe me, it's not. As stupid and/or evil most rulers can be, the civilized countries wouldn't be the way they are without the existence of a high power.

Agreed - let's not... err... do anarchy, I guess.

I don't think the show is implying, that anarchy is generally preferable. Rick calls other Ricks hypocrites, because he himself despises authority, he can't stand anyone having power over him and he considers that a defining characteristic of a Rick. Therefore he assumes, that most, if not all other Ricks feel the same way, but they become what they hate, out of convenience.

Also, please keep in mind - because many people seem to have trouble grasping this - Rick is NOT a good guy, or a role model in the show. He's obviously and admittedly - a self-centered a**hole and just because he says, does or thinks something, doesn't mean, that it's what the writers think the whole world should be doing.

As I said, it doesn't matter if it's ridiculous or bizzare, as long as science is the single explanation given it's pure sci-fi. Sci-fi doesn't actually have to take real life natural laws into account, it just needs to have a world with it's own natural laws. Said world may or may not have some of the same laws that exist in our own world.

In a sci-fi story any relevant laws of nature, that differ from the ones we know from reality, still have to be accounted for. By which I mean - they have to be made clear to the audience. Otherwise - it's a fairy-tale, or a confusing mess. Or a cartoon, as the case may be. Anything can happen in a cartoon - Bugs Bunny can fly into space and annoy Marvin the Martian, but few people would call that "pure sci-fi".

I'd prefer much more repeating plots than jokes.

Your preferences notwithstanding - jokes are usually brief and if the viewer doesn't like one - it's gone in 3 seconds and is replaced by the next joke. If the viewer has to watch the whole episode, where the plot is very similar to an earlier episode - they have a lot of time to be p*ssed off.

As I stated before, rule number 1 of comedy is that a joke isn't funny anymore or at least it's less funny if you repeat it.

Yeah... That's only true about certain kinds of jokes. There are countless examples of jokes and gags, that are being repeated to great - often increasing - comedic effect. Think of "South Park" - how many times did they kill Kenny? Think of "Nobody expects the Spanish Inquisition!" Think of classic slapstick comedy - like a pie to the face. Humor is not as simple and black-and-white as you seem to imagine. And rules are meant to be broken - especially in comedy.

A story however is less likely to become boring the second time you hear it. Even for someone who likes "groan humor", wouldn't they get bored after hearing the same joke over and over?

Not necessarily. Many people watch their favorite bad movies - and laugh at them - over and over again. Many fans of certain shows, or movies memorize their jokes and use them as a way to connect with other fans of the same things. Most groups of friends have inside jokes, which are repeated. Not all jokes have to make you roll on the floor laughing, in order to be worthwhile. Humor is - at its core - a form of human social interaction, deeply embedded in our psychology - it's not just an intellectual exercise in subverting expectations.

The majority of the planet dislikes repeating jokes,

Lol... One day you'll grow up and you'll realize, that you're not the spokesperson for the majority of the planet...

it's a bad decision to repeat jokes if you're going mainstream. You're also more likely to not stand the test of time. If you are going to use a "groan joke", why not make a funny one surrounding the boring one? This way you're going to make more people happy.
And I do think that there are other good options the creators could've used for evil Morty to gain power without repeating the same plot.

I'm sure they could have. There are infinitely many ways to write any story, but someone has to make choices - usually within a restricted time-frame. The writers did what they did and most fans seem to be fine with it, so... I guess they made the right choice?