Stupid child porn law?

Let's say someone who doesn't like me sends me child porn in a ZIP file to my email. I don't know what the attachment is until I download it to my computer, but then it's too late, then I have downloaded child porn to my computer! You know that when you delete something, it's still on your hard drive so a forensic computer expert can recover it. So anyway.. the person who doesn't like me lies to cops and tells them that I'm some perverted pedophile with child porn on my computer. The cops follow up on this fake "lead" and they confiscate my computer and their forensic computer expert confirms it... he find the child porn that the person sent me in a ZIP file. So basically I did nothing wrong and deleted the child porn immediately but I could still get arrested and go to jail and be forever branded a "sex offender". Is this a stupid law or what? Makes it so easy to frame people.