The international security forces seem to have failed to recognise this character's movements for a long time.
What "International security forces"?
There are certainly some safety issues raised by this case, but I have yet to see any concerning security. You do understand the difference between safety and security?
It's a bit too tabloid to start asking a lot of hand wringing "what if" questions without knowing if it has any relevancy at all.
That he is/was using a false identity is perhaps not surprising as he apparently is wanted in several countries in connection with alleged fraud.