The point is that society currently takes video at face value (pardon the pun) A clever hacker could replace the face on security footage of someone committing

The point is that society currently takes video at face value (pardon the pun) A clever hacker could replace the face on security footage of someone committing a crime with yours, put that file back on to security cam dvr, removing metadata that indicates the file was ever modified. Let the police retrieve the footage from the dvr. Do you think a good lawyer could get you off the charges for committing that crime, if you didn't have an alibi? Evidence standards around video will need to change soon, and society isn't ready for this shift currently.