Uh Oh : Change of topic

I was , until now, working on my topic called "Should autopsy be performed without the consent of families to solve a case of crime".
But when I was researching about crime autopsy, I found out that in Korea, the prosecution can take the corpse for autopsy when there is a warrant to claim the corpse a critical evidence of the crime. So my topic has nothing to convince because the police can just issue a warrant. Also, I thought that this topic was interesting but slightly out of my career so I have brainstormed a little bit more and decided to write my essay about "Cartoons have a bad effect on the brain"
I chose this topic because I have alot of interest on cartoons and in Korea many people think that cartoons do more harm than good. I want to write an essay persuading the readers that cartoons are an effective medium of trasferring information.