That depends very heavily on which "people" you have in mind.
They ARE permitted to serve in the armed forces.
they have bitten people, but they bite whatever they feel is a threat to them. It's for self defense, not because we look tasty
Yes its a common Defense mechanism called Displacement.
There is struggle between opposing forces because people want their own rights which they feel they don't get or for protecting their own organizations.
they had part of palestine.
If people can talk about someone else and put them down, they feel that makes them better. They are insecure in themselves. Not worrying about what they say and being secure in who you are is the best defense.
Yes. Not everyone does, but there is certainly a significant group of individuals and groups which feel this way. Please see the Related Question to see those reasons.
he feel it was a door in china
child birth
Yes, in Tennessee, you can legally shoot a bear in self-defense if you feel your life is in danger.
Generally, this stems from the fact that several countries around Israel have threatened its destruction and mobilized armies or militants to that effect.
There is, at present, no such place. Israel is surrounded by enemy nations; and Jews outside of Israel (also) are often the victims of anti-Semitic attacks.