In the US Declaration of Independence we read...
Please send feedback or suggestions
"We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness."
So the Creator has "endowed" us with Life, Liberty and the Pursuit of Happiness.
However, in the LDS church going to the temple is referred to as "taking OUT your endowments"...meaning quite literally...your "endowments" given you by being a human being (life, liberty, happiness) are being taken out of YOUR possession and given or taken by the LDS church.
For example. The church requires your time, talents and all you have or will have. Thus your LIFE
The church requires your unyielding loyalty to THEM expecting you to cut off ties with family/friends who are no longer members...this is asked of you in the questions to obtain your recommend. During the session they make you promise to live the Law of Sacrifice meaning you will sacrifice all that you possess even your own lives if necessary to build up the church.
So...there goes your Liberty.
Finally, the temple requires you to follow very strict rules for the rest of your life. They require you to force these rules upon your children and generations throughout all eternity. "Power in the priesthood be upon me and my posterity, throughout all generations of time and throughout all eternity". To do this common domestic unease and abuse is common. Boundaries are overstepped, parents become tyrants and use control and threats of permanent expulsion to control their children. Any effort put into hobbies or pursuits that are not helpful to the church and it's coffers is instantly dismissed. Control and obedience is paramount. Therefore...there is no Pursuit of Happiness.
So...as stated in the OP. The LDS church is indeed "taking out your endowments". Literally.