Chairman Mao really ought to lay the smackdown on the paper tiger of Dutch Imperialism and their running dogs The Byzantines. More seriously, get Mt Rushmore, Jails and Police State and have at them. The Dutc are in the way of any sort of victory you may wish to win. I would also comment that you really only need to raze one of the dutch culture cities, to prevent that particular victory. The rest ought to be kept to raise your score and make use of any benefits they may have. I would suggest that The Hague is the best candidate for razing, I would also raze Shangian and ?-Hertgenbosch as part of the initial invasion. That should be your main attack. Although an amphibious attack into Amsterdam might be a good idea, but that really depends on the strength of your navy. Your marines may very well be more useful in the main continental attack and holding any cities you may wish to keep rather than gambling them on an attack into amsterdam.