I feel that Mary Kay Letourneau should have married Vili Fualaau! If they have a strong history together, and they both decided to make things work, then the decision was theirs to make. If it does not work out, that is their situation that they will have to recover from.
Although what transpired between Mary Kay and Vili is not how a conventional relationship should take place, the two love each other unconditionally. After serving time in prison, years transpiring, and two children Vili remained loyal to Mary Kay. Most young men his age would have moved on to other girls/relationships. Also the 2 children deserve to be within a family that love each other.
I believe it shouldn't be a question of whether or not they married. Although what she did was wrong in the beginning, the fact that they married and have held a strong relationship for 10 years now should be irrelevant. It is disturbing that the whole situation occurred, but the outcome now that he is of age shouldn't be an issue.
Vili Fualaau is reported to have been gaining an increasing hold on his alcoholism, and testifies to having held on to genuine feelings for Mary Letourneau through previous relationships. Additionally, Mary demonstrates willingness to let go of the past by claiming to return to teaching, and plans to have her status as a registered sex offender lifted. Whether or not this will work out remains to be seen, but there can be little denial of good intentions on both sides.