being a single mom is an extraordinarily difficult job
there are far more single moms than single dads cuz the dads tend to bail
Discussion
Unmarried men might be more likely to abandon their children (I don't know if this is still true, but I assume it is), but we shouldn't assume that a lot of women aren't single mothers, intentionally.
(Sometimes because the father was unfit, of course. Life is complicated.)
But this is a post about wives, specifically.
I'm a fan of wives
Don't forget that the legal system favors the mothers, so it isn't a clear picture of men.