Sure 'foreign' colonization was ugly. Sure, the internecine wars of conquest between 'native American' Maya etal were bloody and terminal, too.
If I understand you correctly, it seems that you believe British colonialism is worse or no better than any other imperialism, whil I believe that there is a recognizable difference, and indeed, the coincidence and contrast of the resultant prosperity and freedom is interestingly correlated with which evil power you had the luck to be colonized by...
| Parent | Colony | GDP per Capita | Freedom (1=free, 5+ = not free |
| GB | United States | 37.8 | 1 |
| GB | Bermuda | 36 | 1 |
| FR | Louisiana | 33.3 | 1 |
| FR | Quebec | 30.5 | 1 |
| US | Alaska | 30.1 | 1 |
| GB | Canada | 29.7 | 1 |
| GB | Australia | 28.9 | 1 |
| GB | Hong Kong | 28.7 | 1 |
| US | Hawaii | 28.2 | 1 |
| GB | New Zealand | 21.6 | 1 |
| GB | Malta | 17.7 | 1 |
| GB | Bahamas | 16.8 | 1 |
| GB | Barbados | 16.2 | 1 |
| GB | Cyprus | 16 | 1 |
| US | Virgin Islands | 19 | 1.5 |
| GB | British Virgin Is. | 16 | 1.5 |
| GB | South Africa | 10.7 | 1.5 |
| GB | Grenada | 5 | 1.5 |
| GB | Israel | 19.7 | 2 |
| FR | Mexico | 9 | 2 |
| GB | Botswana | 8.8 | 2 |
| GB | Ghana | 2.2 | 2 |
| FR | Mali | 0.9 | 2 |
| US | Philippines | 4.6 | 2.5 |
| GB | Jamaica | 3.8 | 2.5 |
| GB | Lesotho | 3 | 2.5 |
| GB | India | 2.9 | 2.5 |
| FR | Senegal | 1.6 | 2.5 |
| GB | Antigua & Barbuda | 11 | 3 |
| FR | Seychelles | 7.8 | 3 |
| GB | Sri Lanka | 3.7 | 3 |
| GB | Kenya | 1 | 3 |
| FR | Madagascar | 0.8 | 3 |
| FR | Fiji | 5.8 | 3.5 |
| FR | Burkina Faso | 1.1 | 4 |
| FR | Niger | 0.8 | 4 |
| GB | Nigeria | 0.8 | 4 |
| GB | Zambia | 0.8 | 4 |
| GB | Singapore | 23.7 | 4.5 |
| GB | Malaysia | 9 | 4.5 |
| FR | Gabon | 5.5 | 4.5 |
| GB | Uganda | 1.4 | 4.5 |
| FR | Morocco | 4 | 5 |
| FR | Djibouti | 1.3 | 5 |
| GB | Brunei | 18.6 | 5.5 |
| FR | Tunisia | 6.9 | 5.5 |
| FR | Algeria | 5.9 | 5.5 |
| FR | Mauritania | 1.8 | 5.5 |
| FR | Cambodia | 1.7 | 5.5 |
| FR | Togo | 1.5 | 5.5 |
| FR | Chad | 1.2 | 5.5 |
| GB | Swaziland | 4.9 | 6 |
| GB | Egypt | 3.9 | 6 |
| GB | Zimbabwe | 1.9 | 6 |
| FR | Haiti | 1.6 | 6 |
| FR | Central African Rep, | 1.2 | 6 |
| FR | Congo | 0.7 | 6 |
| FR | Vietnam | 2.5 | 6.5 |
| FR | Laos | 1.7 | 6.5 |
| GB | Sudan | 1.1 | 7 |
| GB | Cayman Islands | 35 | NR |
| GB | Falklands | 25 | NR |
| FR | French Polynesia | 17.5 | NR |
| GB | Gibraltar | 17.5 | NR |
| US | Puerto Rico | 16.8 | NR |
| FR | Martinique | 14.4 | NR |
| FR | French Guiana | 8.3 | NR |
| US | American Samoa | 8 | NR |
| FR | Montserrat | 3.4 | NR |