Because he has 6 more races with the team to go. Any rational person will not rock the boat while you have to live in that environment.
Is it really that hard to figure out for you....jeez.
Quite frankly I find it rather hard to see how Lewis, after announcing he is leaving, could really rock the boat more significantly with a few ill advised words. There is a pretty good example from 2006 of such utterly idiotic comments amounting to diddly. Lewis rocked the boat quite enough by completing the move. More to the point the people that have actually worked for his car might feel more insulted by fluffy words which do not ring sincere than by some bitter comments which did. If he was worried about how his crew felt he should keep his trap shut.
Besides you failed to answer the pertinent question, why would he feel compelled to spill his guts after he leaves the team. Washing dirty laundry in public would still hurt his reputation on the paddock big time.
Edited by Oho, 04 October 2012 - 13:28.