Hey, guys! 
I'm confused between the usage of by/because of for this particular scenario.
1) ..emotional injuries inflicted on them by the tragedy/tragic incident
2)..emotional injuries inflicted on them because of the tragedy/tragic incident
3)..emotional injuries caused to them by the tragedy/tragic accident
4)..emotional injuries caused to them because of the tragedy/tragic accident
When should we use by/because of? What's the distinguishing line between them?
I'm confused between the usage of by/because of for this particular scenario.
1) ..emotional injuries inflicted on them by the tragedy/tragic incident
2)..emotional injuries inflicted on them because of the tragedy/tragic incident
3)..emotional injuries caused to them by the tragedy/tragic accident
4)..emotional injuries caused to them because of the tragedy/tragic accident
When should we use by/because of? What's the distinguishing line between them?