I’m sorry, but displaying those images outside of a church is just classless. We shouldn’t need a law or court case to tell you not to do that.
If that "church" supports abortion "rights" it's as valid a target as any other. The argument about children carries more validity (the probably hypocrisy of its proponents notwithstanding); I'd like to see the protesters take care to turn those images away from view when children are approaching the church. Although one also wonders how many children are in the congregation of a pro-abortion "church."