Well it wasn't about stepchildren but when my son was born my husband (his father) gave him little attention. My husband and I already had our own problems and I was seriously considering divorce. When my son was a year and a half old my H poured some gasoline into a pop bottle and put the cap back on and left it lying on our front porch. When I told him that was dangerous because our son could open the bottle and would think it was soda and H's response was, well you leave dangerous stuff out too like your fingernail polish.

Idiot. It confirmed that he wasn't and probably never would be a good parent so I no longer wanted to stay in the marriage to benefit the child. Unfortunately since they are not your biological children you won't get to take care of them when/if you divorce but yeah being a bad parent is very unattractive.