I would say that most of what we get angry about has to do with our ideas about morality. So it's intrinsic to what we each find important. People who believe strongly in a certain ideology will have a passion for it, and they will believe that other people should feel the same way, generally for the benefit of society as a whole.
When one religion uses government to oppose its immoral values on others, it is a tyrannical taskmaster who causes those who are enslaved to those moral values to feel great pain. And it IS slavery. When I must work to pay taxes to support systems that I believe are immoral, and when MY pacifist religion has been made illegal thanks to a religion that disagrees, and the full force of the government stands behind that immoral value system, it becomes slavery.<br />
Any trapped animal will lash out in anger. It's an instinct. The answer is for christianity to get out of government, and for government to allow me the right to practice my non-violent religion. Then I have the freedom to treat others with equality and justice.
I believe it all has to do with the ego. When you disagree with someone's morals they feel like it is a personal attack. You think you are superior to them and their belief systems.
People fear what they don't understand.
Because in many cases you're atacking a belief that they themselves may not have given much thought. They often will not have any answer ofther than "I believe it's wrong." People are comfortable with being told things are wrong, they aren't always comfortable when you explain why. Other moral issues spawn psuedoscientific/scientific responses, then it becomes a battle of facts. When morals are opposed people can be actually offended and get emotional and when emotions are overly involved it ruins any point being made.<br />
The most common example is homosexuality, There is nothing good or bad about being gay. People who are against gay rights such as marriage often have fear ba<x>sed reasons that are always ba<x>seless. Such as it leading to "gay indoctrination", acceptance of ********** and **********, and "is against god's will". In fact when a lawyer was asked at a hearing "what have been the negative impacts of gay marriage in the state, since gay marriage has been legalized" He could not think of a single thing that would hold up in a court of law.<br />
In short, morality is either religiously mandated (homosexuality, murder, theft, etc) or legally mandated (anti-sodomy laws, prostitution laws, segregation laws). When laws that are religiously ba<x>sed are challenged in court, the typical ruling is that unless they can find any legally admissable reasons for staying on the books, they are often struck down as being unjustifiable. That's why sodomy laws, laws against vibrators, and other laws against "Immoral" behavior are often rendered null.
Some people don't know how to accept others for who they are. For some, accepting other's morals means their own way of thinking is being threatened, as if only one person can be right and one person has to be wrong.
because people stick to their point of views like if it were a matter of life and death
I think because they have no control over this issue at hand.