I always hide when Jehovah's witnesses come knocking but if that's their thing why should they have to stop because of Islamic violence ? Islam needs to adapt to western societies if it can't then we need to manage that not change everything we choose in a free society to adapt to them
Because attempting to convert someoene goes against the principle of live and let live. Those who feel the need to convert are essentially saying that they are right and the persons they are trying to convert are wrong. They don't accept that their is more than one path to salvation, if that is indeed a goal, or even that there may be no god at all.
Conversions and attempted conversions cause divisions in families and societies. You will find that if you invte the Jehova's witnesses into your house, welcome them in, have a reasoned discussion with them... they will be very polite but they won't come back once they realise that they aren't going to persuade you. For them it's a numbers game. The people that tend to be persuaded are vulnerable people.
And when you have a group engaging in conversions, you will find another group fighting back. One of the problems with Islam too is that converting others is a duty of every Muslim. It then becomes a strategy of the community. It's just inviting trouble.
You think Islam will change? Wishful thinking. Just look at the history of the world since Islam came into existence. Remember, you said you can't wait for a solution that will take time to evolve.
The mistake Britain made was not laying down some rules before the influx. You either now have to introduce some rules that should apply equally to everybody. Or you have to say that generally speaking, we don't want Islamic communities here. The latter will not go down well.