Sharia law is a large part of islam so should all muslims follow it?

under featured news on yahoo today. it tells about a school teacher that didn't wear his pants above his ankles as required under sharia law. so he was hung in the town squire and to get there point taken more seriously the taliban also killed amjad's father. this happened 80 miles north of pakistans capitol. how many muslims would love to see these sharia laws world wide? sura 5:44 allah declares that whoever does not want to abide by allah's law, the sharia, will burn in hell;