Personally, I don’t trust men to take any birth control pill (at least the majority of them). They look at pregnancy prevention as a woman’s issue and they’re just interested in the pleasure of sex, not the management and responsibility that comes with it.
I also think that if many men were that interested in doing their share of preventing pregnancy they would do a better job in petitioning for their own birth control rather than merely sitting back for women to fight for their bodies alone.