Copypasta'd from the IMDb topic I made on it:
Everything we see is really just in the minds of children playing make believe.
How does this make sense?
First off, they chose to be teenagers since as kids they want to grow up but as adults they'd have jobs. Hence, they choose teenagers, who are for the most part the best of both worlds. To kids, teenagers have it so much easier. In fact, how teenagers are depicted on the show are more in line with what a child might see when they look at their teenage brothers and/or sisters, an older, wiser, cooler elder who always has cash to burn, can drive, and have greater degrees of freedom in general. But even in other kid-friendly shows such as The Facts of Life and Saved by the Bell, teens also deal with peer pressure, underage drinking, drugs, sex and so on. But if these "teeneagers with attitude" are actual teens, then even on a kid-oriented show they'd deal with such issues to a degree. And if their teacher taught teenagers, would she REALLY be so sweet and motherly if she taught hormonally-charged proto-adults who have *beep* impulse control? She'd probably be a nervous wreck!
Another thing, good and evil literally exist on the show as absolutes without any grey areas. Good guys are good. Villains are evil. No ifs, no buts. This is because children don't really get the notion of degrees. To them, if you're not good you're evil and vice versa. Look at the shows and movies and so on kids are exposed to. Good and evil are clear cut, with no neutrality. So they take what they learn from TV, movies, video games and comics and apply it to real life. If a teacher gives excessive homework or has an overall bad attitude then the teacher must be evil. But if another teacher doesn't give out pop quizzes like Halloween candy or such then that teacher is good. So it could also be that all the villains and allies are based on who they encounter in their day to day life. Rita Repulsa could be based on an old spinster or a mean teacher, while Zordon could be based on a real-life version of Ernie. And to children, good wins all the time. Hence, each episode ends (for the most part) with a flashy "bye, Felicia" to the monster of the week.
Also, in real life bullying is too serious to rationalize making bullies into comic relief characters. So to take away most of their bullies' power away, the kids naturally morph them into joke characters. Also, let's be real... Bulk and Skull are really just a human Squat and Baboo.
Then there's the monsters. Raised on bad monster movies on TV, mutant monstrosities in comic book pages and genetic abominations in almost every video game, they naturally believe monsters should look like that, in lieu of like someone a child thinks they can trust until it's too late.
And now let's look at how each series literally takes place in a new town but yet looks EXACTLY like the previous series' show. All the kids know is their own town and what they see on TV. I mean, does EVERY town in America have a shopping mall? Not really. Semi-abandoned rock quarry? Even less so. Bustling downtown area with tall-AF skyscrapers? More than the ones with quarries. All three? Not common enough for EVERY. SINGLE. SERIES!
But why continue the story after all these years? The original kids shared their stories with their friends and it grows from there. They outgrow their fantasy world and new kids take their place. Why this particular story? Does there HAVE to be a reason? Perhaps the original kids shared their stories, bringing in new friends when their old ones move away and over time, this simply becomes sort of a playground mythos, with each new year being a new set of kids telling their own stories inspired by the same mythos that they were introduced to the previous year. And then there's the theory that what we consider fiction is just an interpretation what someone else sees via a subconscious psychic connection with another universe, and that the fantasy world these kids dreamt up is what Haim Saban saw, and then just filled in whatever blanks existed himself. Hence why they're somewhat based on Super Sentai.