besides the meaning vi_edit said, i think it also points out how ironic sometimes people are. the colonel appears to hate gay, but he is gay. the little girl always say how much sex she has had, but ended up she has never had any, and so on so on. and IMHO (again just my feeling):
1) the colonel has to kill kevin (sorry, forgot his name in the movie) coz' he has leaked his secret, but he can't get the "love" the needs
2) hmm, probably coz' she thinks she has to fight for her "rights"?
3) it's a inherit thing developed by his dad, that the colonel has this high / untouchable respect
4) his wife..... that's an interesting one.... to make the movie more interesting?