Why Do Christians Advocate Obeying Leviticus Regarding Homosexuality but Not Other Laws?

https://www.godtube.com/resource/mediaplayer/0j0cj1nu.mp4;https://content.swncdn.com/godtube/2012/09/18/414915-004.jpg;https://www.godtube.com/watch/?v=0J0CJ1NU;