1st: The original meme is in response to a specific event...
https://abcnews.go.com/amp/US/woman-falsely-accused-texas-state-trooper-sexual-assault/story?id=55407714
2nd: Your explanation there merges two separate points of view; A) that Media/Socialmedia is jury in these events even before they are made aware of all the facts surrounding the events, which is true and that is a problem in the current information based society we now live in. & B) Thought guilty by LE is guilty is just not true if you look at the entire due process of a conviction and case laws surrounding rights of the suspect. For starters, look up "FRUIT OF THE POISONOUS TREE" Doctrine. Also, based on the prosecution process, there are far more Wrongful Acquittals/Dismissals than there are Wrongful Convictions thanks to our Due Process to protect the citizens against violations of their rights.
& C) If ANY government official violates a citizens rights, they are in violation of established law. Guilt or Innocence is established in a court of law when going through above mentioned "Due Process", not in media/socialmedia. Which is where a lot of the Case Law comes from that I mentioned in response to your Batman & Robin meme.