No alternative to deal - Paisley

In the first full-length interview since agreeing to go into power-sharing with Sinn Fein, Ian Paisley says he had no alternative but to do a deal with Sinn Fein "for the good of Northern Ireland".
BBC:

So people have been working for years to bring about a lasting peace while this **** did everything he could to sabotage any meaningful progress and now he's going to step in and take the credit for bringing peace to Northern Ireland.

I find it odd that he has never before done anything "for the good of Northern Ireland". I think it most likely that it was made plain to him that he would be out on his arse if he didn't do a deal "for the good of Northern Ireland".