The risk was understood, and mitigated as far as possible.
Are you convinced by what you are saying considering that mitigation didn't prevent occurrences to happen 24 years after the first one, including numerous similar fuel tank perforations?
As many have said previously, 737's, MD11's still fly around despite having well publicised faults and there are plenty other issues less well publicised.
737 and MD11 might have some faults, you can't compare the amount of hours flown by concordes with other aircrafts. Concorde had a tire incidents rate 300.000 times higher than on A330. Not only the tire incidents couldn't be reduced to a reasonable level, but the main issue with the fuel tanks being regularly perforated was not mitigated. This has little to do with one specific operator or one specific country...