Kojima has always wanted to be part of Hollywood, he loves movies. It's been a big part of his life. It's what helped so many choices of his games, you only got to look at some of his earliest examples to where we are now. If he could he'd be making movies, but he'd flop if he did. Gaming is what he does because it's the best he can do and if he can get certain people to be part of them so much the better. It's why he did the VA change, because if he could he'd have all famous people being part of his works. In every aspect. Damnation to whoever had been in the role or part. He wants to be one of his legendary directors he adores. It doesn't take much to get it or what he wants.
Likewise we can tell Hayter really thinks a lot of his part in the series, that Snake is something he holds dear to him. An important part. He's not the first to have become attached to a role, it's happened in many media formats to many different people. It's a part of them, we all know how it is to have something taken from us or having to give up something we enjoy or love. So it's not hard to know his feelings on the matter either. He's passionate about it.
And Kojima is passionate about what he wants, hence the problem.