Fantom
Sorry, your talking utter rubbish.
Committing to land at your destination (with 'landing assured') is perfectly legal, provided you land with final reserve fuel. It's makes perfect common sense to most and is in most airlines part A and as such is available to pilots as part of their inflight fuel planning options.
BTW Runways being blocked etc etc has nothing to to with the definition of 'landing assured' - unless, of course it was blocked already...