Sikhism does not demand forced conversions, that is true.
I rather have a disciplined mind any day, than freedom which leads me to be disrespectful to my faith. What good is one's 'freedom' when the mind is not trained to use it sensibly? Our minds cannot be trained to be disciplined without Guru ji's help and guidance. An undisciplined mind is what makes people behave like animals, that's is why we need Guru ji's guidance to learn how to refine and perfect our minds, so that we can utilize our freedom to make refined and perfect choices. It is Guru ji's Bani that helps us to chisel our minds. Guru ji intended for a sikh to marry a sikh in order spread sikhism. If sikhs had followed this hukam every sikh would have ended up with a disciplined and perfected mind!!
There are so many sikhs married to westerners and their children have either become atheists or converted to muslim religion, because no one took the time to teach them their father's religion. Some of them are also either divorced or separated or alcoholics!!
Being modern does not mean a person should forget their religious/spiritual identity. If that was the case then why would majority of sikhs born in modern western countries still have sikh first names? Those names have their origination in the sikh religion itself, don't they? Why don't they consider them to be obsolete or outdated and not suitable for modern times? Why do they still eat the panjabi food in modern western countries then? Obviously, saag and makki di rotti, aaloo walley parontheys, cholley with puryiaan, aallo barryaan and black, brown and yellow daals don't belong to the modern western countries, why do they still eat them? If they can enjoy their typical panjabi diet in modern western countries, what is stopping them enjoying their faith which is so precious, more precious than food?
Why do they still believe in the ugly, odious caste system in the modern western countries? Do they for fraction of a second believe this belongs or should belong to the modern western countries in which they are living?