^ I do not agree with you. You cannot blackmail someone into doing something that they were already arranged to do. The only thing Kos did was offer T'Pol more incentive to get married at that moment in time because she had brought shame to her family.
As I have already pointed out, the marriage
was prearranged but did not
have to occur. In Breaking the Ice, T'Pol essentially kicked Kos to the curb by refusing to marry him. If T'Pol had not returned to Vulcan, Kos would never have been able to continue his pursuit of marriage and the arrangement would have become moot.
If anything Kos was just reminding her of her duties and arranged obligations. Just because he prompted her on the benefits no way implies blackmail.
T'Les lost her position because of T'Pol's actions at P'Jem, so T'Pol felt responsible. After Kos told T'Pol that his family could help T'Les regain her position (but only if T'Pol married him), T'Pol relented and married Kos. She would have
continued to refuse to marry Kos but for her desire to help her mother and the
gallant Kos tying his offer to help T'Les to the marriage.
It was blackmail because Kos forced T'Pol to either marry him or her mother would never be reinstated to her position. He used T'Pol's desire to help her mother against her. Yes, real noble.
If Kos had really been the guy you seem to think he was, he would have offered to help T'Les regardless of T'Pol's refusal to marry him. Now THAT would have been
unconditional love. And ironically, that might have caused T'Pol to view him in a different way and she may still have ended up agreeing to marry him.
And just like you, I'm sure Kos felt justified in his actions because of the "arrangement", but looking at his actions objectively makes him look like what he was, a jerk.