Does this mean we find both 'heaven and hell' in this very world depending on how we did???
In Buddhism there is a belief in hells, and ghost realms as well as heavens. These are transitory states though and not eternal. Your stay in each is down to Karma. Some people interpret the Samsaric worl as described by Buddhists as a psychological map too. Certainly there are humans who live in a mental hell, if not a physical one.
But even in the case of Karmic life you never know what treatment you will be meted out, do you?? It's better to be 'accountable' to the Supreme One rather than left to suffer for Karma indefinitely...and unspecifically. Surely I would not like to be reborn a rat....or was I a dormouse in my previous life?? No one can tell. If i am doing good in this life doesn't mean I was a lion in my previous life or I am a condemned one because i was a pig ....
There's no eternal in samsara, and so you are subject to your karma only until it runs out. Surely no-one would want to be an animal, and that's one of the things which encourages a spiritual life. Taking control and becoming better.
It is distressing to note that Buddhism has been split into sects..and swerved away from its basics.
You'll have to be more specific in what you mean by sects. Certainly there are different strands or schools of Buddhism, but I don't see that as a negative point. The fact that they don't adhere to the same practice is down to different teachers with different emphases. I knew a Doctor called Dr. (Phil) Rewata Dhamma who was highly regarded as both a Therevadan practitioner, as he was originally from Burma, and also a Mahayana practitioner too. I think the mistake is to regard the three aspects of the path - Therevada, Mahayana and Tantra as different. They have a different focus, but the basis is the same - the teachings of Buddha and his example. That there have been developents which have enhanced the teachings is a good thing.
Remember king Asoka of India soon losing his control and power as a king and resulting in the death of the great Mauryan dynasty after conversion to Buddhism??
As I've said before, this is not the accepted version of the story.
http://en.wikipedia.org/wiki/Ashoka
The dynasty crumbled after his death - forty years after, according to his article. Your assertion that it was due to the adoption of Buddhism as a state religion is not borne out. It was of course those who inherited the dynasty after.
I think it sometimes becomes necessary to kill......to ensure your own life?? That is simple nature which doesn't permit peace the world is looking for....you cannot change that 'instinct' , can you?? But Buddhism tries to subdue it and is therefore a religion bereft of action.
It may be necessary to kill in order to protect your own life. Buddhism's stance on this is "what is your motive?" Suicide is seen as an action that is counter productive except under very special circumstances ie the monk who immolated himself in protest at the Vietnam war. His motive was to engender peace.
In terms of war, HH lost control of Tibet to the Chinese in 1959. Despite the atrocious treatment of Tibetans by the Chinese, he has always advocated peaceful protest. This is because killing others is more harmful in karmic terms than being killed. You're right in that it is against the instinct for life, bu this instinct is a samsaric taint and not to be trusted. After all, the Buddhist's ultimate aim is to liberate all beings from samsara and this self regarding instinct.
By the way, one of the parts of the Noble 8-fold Path is right effort/ action.