Dear cosmo:
You probably didnīt think twice before saying "a ban of passport holders from terrorist contries" (such as the Chinese has imposed) would in my opinion be appropriate.".
Your idea, put in practice, would get a good deal of humanity grounded. Even excluding the middle eastern islamic terror groups, here are some examples of countries whose citizens would have visas denied (and their active terrorist groups):
AFRICA -
Rwanda - ALIR;
Sierra Leone - RUF;
South Africa - PAGAD.
ASIA:
Cambodia - Khmer Rouge;
Georgia - Zviadists;
India - Sikh Terrorism Group;
Japan - Japanese Red Army, Chukaku-Ha, Aum Shinrikyo;
Philippines - CPP, AB Brigade, NPA;
Russia - Zviadists;
Sri Lanka - LTTE.
EUROPE:
Germany - RAF;
Greece - 17 November, ELA;
Italy - Red Brigades (BR -PCC, BR- UCC);
Spain - ETA, GRAPO;
Turkey - DHKP/C;
UK/NorthernIreland-Ireland/Irish Republic - IRA, CIRA, LUF, OU, Real IRA.
South and Central America -
Bolivia - EGTK, ELN;
Chile - FPRM, Lautano Youth;
Colombia - FARC, AUC, ELN;
Ecuador - Puka Inti;
Honduras - FPM;
Peru - Sendero Luminoso, Tupac Amaru.
The Israeli Kach and Kahane Chai group could be added to the list if youīd like. One could extend the ban to US citizens too if the untra right/fanatic militia groups which welcome people like Timothy Mc.Veigh fit into your classification...
The flourishing of simpleton visions and judgements dividing the world between "us" and "they" is precisely one of the goals of terrorists and one of the foundamentalist groupsī indoctrinating methods.
More than ever itīs time for us to see the many shades of grey, instead of just black and white. And Iīm not even talking of colours...
Sources:
The Counter-Terrorism Page:
http://www.terrorism.net/groups/
Dudley Knox Library
Naval Postgraduate School:
http://web.nps.navy.mil/~library/tgp/tgp2.htm
Hugs to all.