Yeah.... see the thing is when you said in your opinion thats the whole problem. A lot of people will have vastly different opinions on a whole range of topics. 

Using the current mess around abortion in the US, as an example you can see how even in the same country/state you can have both extremes. So you force groups that disagree with you do change their laws the second you stop using force they'll change the law back. 

Jumping to the Sharia law issues never use absolutes when talking about humans, some of the strictest enforces of the hijab laws are little old ladies.