1. We are all born the same
That is false. Many are born missing limbs, missing organs (some are born without brains literally) lack of vision or hearing, and other maladies.
If your intent was that "we are all born the same" meaning we all have certain unalienable rights, then that would be 100% true.
2. Our development is dictated by our environment
Also vague and ambiguous.
We are all born with certain skill-sets.
All surgeons are doctors
but not all doctors are surgeons and they can never be a surgeon and it doesn't matter how many $Millions you spend training them or how many classes they take or Useless Tube videos they watch or self-help books they read or self-help groups they attend it will never happen and "never" means at no time ever.
And then you have the stupid people who think we should have more medical teaching facilities.
Only a small percentage of any population has the doctor skill-set and an even smaller percentage have the surgeon skill-set so how many do you think also possess the teaching skill-set?
Creating more medical teaching colleges creates lots of vacancies which can only be filled by paying higher salaries which will drive up the cost of medical care and leave other medical teaching facilities scrambling to fill vacancies and that means paying higher salaries to keep people from jumping ship.
Just because a doctor or surgeon or anyone has the teaching skill-set, there is no concomitant obligation to perform it.
Skill-sets are genetic. You want me to work in the trades? Not gonna happen. I don't have what it takes to be a carpenter, or plumber, pipe-fitter, electrician, welder, or mason. I'm an excellent guitar player but I'll never be a great one because I lack the improvisation skill-set which is why I can't write music or lyrics. I can copy people to a "T" and that's good enough for me.
The role of the education system is to identify those skill-sets children have and develop them, but our education system is a dismal failure.
And then we have the role of parents in the environment. Dope smoking beer swilling parents don't take time to read to their children or give them the proper toys to develop motor coordination, eye-hand coordination, and thinking skills. Then you have the mothers with the revolving door on their HUD Section 8 apartments who throw a bag of chips and 2 liter bottle of Mountain Dew at their 3 year old because they're too busy banging away.
Once the brain goes through its hard-wiring around age 5, it's over. You can't undo the damage and those kids are behind the 8-ball and by the time of the second hard-wiring during puberty, it's all over but the fat lady singing.
3. Everyone has their own version of what is "right"
Not necessarily true. Some people actually are right. With respect to morality, it doesn't really matter since morality is absolute.
4. Most people couldn't care less
That's true.
Only about 3% of the population are good people.
They will always do the right thing regardless of the costs whether that's losing their job, or losing their family and friends or community standing, or suffering financial losses or whatever.
About 15% of the population are basically good people. They will do the right thing but only if it costs them nothing. So they'll turn a blind eye to the racial discrimination or sexual harassment in the work-place or they'll sit quietly on the bus/train/subway while someone demeans and debases another because they're afraid.
About 60% of people are not good people. It isn't that they're bad people it's that they will only do the right thing if they are rewarded in some way and the reward need not be monetary. It can be a 30 second sound-bite on TV.
Roughly 12% are basically bad people. Some are opportunists and will prey on others and some are thrill-seekers or seeking approval but they will always do the wrong thing.
Then you have the 10% who are sheer evil and will kill you just because they saw two birds in a tree.
So, yeah, 82% of people do nothing or worse make a mess for everyone else to clean up.
5. As a species, we are improving
Well, we do have the longer lasting light bulb and 24-hour convenience stores.