That sounds as intelligent as downvoting all comments that contain the letter “t”.
Downvoting different opinions (we are not event talking about insults, racism, … here) is a perfect way to create echo chambers. Guess, why Facebook, Twitter and like 80% of all social media sites never introduced a downvote… Guess, why YouTube removed the downvote… Because the average user does not seem to be able to accept different opinions without flooding the platform with downvotes.
I think, you have also a few opinions where 7/10 people have a different view than you. 70 people press downvote, 30 press upvote. Now, you are at -40 and think about removing your post, although a 70/30 opinion isn’t that crazy at all.
I think, downvoting every different opinion hurts the platform. That’s why my like/dislike ration is probably like 98/2…