I think there are way more many good men out there who may excellent fathers/stepfathers than there ever is bad ones.
We must use our own judgment and get to know the person really well before marriage but that is the same even if people don't have children.
I was sexually abused as a child and I could have easily had the mindset that all men are evil and want to harm children but then I knew that logically wasn't true at all.
When I married my second husband 30 years ago I had three children of my own (one boy and 2 girls) and he had two girls. One of the best most valuable gifts I have ever given my children is to give them the daddy they have and no, they don't call him their step-daddy but just daddy and their real father is called 'dad.' I knew my husband was true and genuine and he has proved he loves all five of our children the same. There is nothing he wouldn't do for all five of them......just like all 5 know how deeply and truly I love all of them. We have never referred to any of our children by labels of step-children. From moment one when we became a family unit....they become our children. period. Our children also do not but labels on their siblings......they are simply brothers and sisters.
So I don't think that is a reason to not get married to a man. One must know their partner well before they marry and that goes for men who should really know the woman well too.
If I had had the mindset that all men are really creeps then I would have lost the best man I could have ever dreamed of having as a husband and my children would have lost tremendously too. They see both of us as their protector, supporter, and moral leaders, and we both have led by example. All of them are grown now with good marriages of their own. They have seen with their very own eyes how love and respect is so important. They have also seen how a solid marriage can be fun when both totally committed to one another. But most of all they have grown up knowing that being a blended family just means there are more children and siblings to love.
What seems to happen often now is these women don't even take the time to really know the person before they move them into their house or move in with the man along with the children or even when they marry them. They tend to put the importance of having sex with the man over their children's own well being. Those kind of relationships will never work.IMO
As long as women have their priorities straight there are millions of good potential fathers out there for children who desperately do need a father in the home. He plays a different role but no less valuable to the upbringing.
IMO