Some rights for all people include:
marriage
adoption of children
inheritance from a spouse
freedom from harassment
safety at work or school
freedom to be who you are
Unfortunately, in many places, gay people lack one or more of these rights. In that situation..
Yes, all gay people in the United States have some rights, but depending on the state, they may be lacking some important rights, such as the right to marry, and the right to not get fired from a job for being gay.
They have their own reasons.
Gay people marched. And voted. And picketed. And boycotted. And marched some more. And never ever gave up.
Gay people were not specifically considered upon the writing the Constitution, so there aren't any real "Gay rights" in the Bill of Rights. Although, the Bill of Rights still applies, I guess.
It varies by country. Some countries do not give gay people equal rights.
Gay people don't have rights because the government is stupid. And is controlled by homophobes. Gay people should have the same rights as everyone else. So what if guys like guys or girls like girls? It's not affecting you unless your gay. Gay people should have rights.
If you are asking if equal rights for gay people are important, the answer is yes.
There are many ways gay people are denied their rights. As of 2013, Gay people are still denied the right to marry in 36 US states. Many of those states also ban gay people from adopting or visiting their partners in the hospital. Gay people can also be fired from their jobs for being gay in 31 states.
Women's rights and gay rights definitely have some overlap, but the differences are in what rights are lacking.
Because all people have rights.
There are no "gay rights". Gay people should have every statutory and Constitutional right Straight people have.
Gay people are treated better than they used to be in some areas because of the hard work of people fighting for equal rights.