I fully agree. It is a rare man that enters a relationship with a woman and accepts her children (by another man) as his own. More often than not, the children are seen by the new man as an annoyance, who not only "gets in the way" of his relationship with the woman, but compete for her affection as well.
Now most men in this situation would never physically harm children but they will do a number on them emotionally. I have close family members who grew up in broken households. They tend to have cold, distant relationships with their stepfather (and stepmother as the case may be).
When the single parent takes on a new partner, the children are often shunted to the side and left to fend for themselves.
True. Most people are not violent, but the relationship is often cold and unloving.