The thing is this is not the first time this has happened with Buttler. He has been out in this fashion against Sri Lanka in 2014 ODI series. At that time, he was warned firstly by Senanayke but Buttler still didn't rectify that and in the end got out in the same manner. So Buttler is not unfamiliar with this type of dismissal. I am posting a tweet that I saw which shows how Buttler was leaving the crease even before Ashwin actually did this.
Again, I don't really care even if there wasn't any proof because what Ashwin did was within the rules of the game. If people have so much problem with what happened, change the tweaking rule. This is not the first time this has happened and let me tell you that this certainly won't be the last.
Now when it comes to Ashwin, this is also not the first time Ashwin has done something like this. Ashwin did this to Thiramane in 2012 tri series in Australia. However at that time Sachin and Sehwag withdrew the appeal. Also the famous T20 WC 2016 match against Bangladesh which India almost lost, Ashwin wanted Hardik to perform Mankad in the last over as he saw non striker leaving the crease early but of course that didn't happen.
What has bothered me the most is the past players coming in and having a go at Ashwin which is ridiculous because some of these past players have done things which is way worse than yesterday's incident.