So, if a person is born with enough compassion and altruism that will stop them.
Then why aren't we born with enough compassion and altruism to always stop us ?
As I said before we are part of the evolution. Your first incarnation, you will be pretty much like an animal (animal do care about their family and their pack). After that it is up to you (by your thoughts and deeds) how much compassion and altruism you develop over many lifetimes. Again your question is why did the Gods not make perfect humans to stat with.
One might not believe those teachers.
What if they didn't choose not to care ? What if they just don't care ?
What would make them care ?
There is not a question of 'what if'. Of course, lots of people don't believe (like you for instance) and lots of people don't care. Actually, it is not necessary to believe any teacher or even believe in God. But if you don't care about your fellow beings and indulge in evil acts, you will suffer the karmic consequences and maybe someday regret it. When you suffer as a result, you may also feel empathy for others who suffer - maybe they will start caring.
Not even that. You have said that,in a sense, at the very start we are perfect ( for instance, we only eat when we are hungry ), but that we tend to lose this perfection as time goes by. Why not make it so we don't lose this perfection as time goes by ?
Eating only when hungry is not perfection. Perfection is when you become knowledgable, wise, altruistic, selfless, 'self actualized', 'self realized', 'enlightened' etc etc. Evolved from an animal form, you should not expect to be all these things in your first incarnation. If is only after many lifetimes of struggle that you can achieve these things.
Would you prefer to watch a movie with real people suffering ?
Not really, but it is interesting to watch people fight against adversity and eventually win against seemingly unsumountable odds. Anyway, if people suffer in real life, it is always due to their own past karma. But overcoming that suffering, actually helps them grow as a human being and as I said before eventually liberates them from life of earth.
BTW, you should read some modern physics/cosmology etc. They will tell you that time is an illusion. This endless suffering you see, is from another perspective, quite momentary. The body itself is temporary too, once the cycle of birth-death is over, their is no pain, no hunger, no want. Even between lifetimes, most of us get plenty of rest to recover from the previous incarnation.