Why do you decline take backs ?

I don't allow any takebacks. Reasons as follows:

1. Development. One becomes a better player by being punished for blunders and learning to examine the board more carefully.

2. Emotional. I don't feel like a winner after my opponent has set me on my feet previously.

3. Justice. Avoids feelings of unfairness. When should one take back and when not?

4. Errors are part of the game. Tartakower I think says something like, the winner is the player who commits the penultimate error.

I once tried quite risky (stupid) strategy, where I had to sacrifice two knights and hope he would do a mistake to get his queen.
It worked, and the guy asked for a take back. It means I was supposed to lose my knihts but not take his queen.I declined, of course, and he complained like "YoU Are nOt a nIcE pLaYeR".

Did you think I gave you my knights for free ?
Am I supposed to accept all your take backs until you win ? Sorry for trying to win the game with my skills.

Playing fast and asking for a fully-comprehensive insurance is batshit insane resp. schizophrenic.

I never ask, i never accept. But i only play 1+0 and 3+0. On long time controls (15+15 and longer) when i would see this as a training game i would maybe be more eager to accept a takeback in a obvious situation, e. g. when the opponent plays Qe7 instead on exchanging with my queen on e8.

I once played a game where my opponent misclicked during castling. I accepted the takeback. Later in the game I made a clear mouse slip. That same opponent declined. I turned off takebacks entirely so that would never happen again. If I mouse slip now I'll either just play it out if there is counterplay & momentum or just resign. If my opponent mouseslips they can either play on or resign. It's much better with takebacks not even factoring into the game in my opinion.

Mouse slips seem to be the most common argument for a take back - as if piece-handling errors are exclusive to online play. However, over-the-board games have the touch-move rule, so piece-handling errors are not just a computer issue, per se. I know some might argue that a mouse slip is more akin to accidentally bumping a piece while attempting to move a different piece (which does not force a player to move that piece). Fair enough, but also consider that online play has no touch-move rule. You are allowed to click on a piece and drag it around to help visualize possible moves and then move a completely different piece. I think that is more than enough compensation for the occasional mouse slip - especially considering how often most online players 'touch' pieces that they never move.

Analogies aside, I don't allow takebacks or ask for them because they are not part of the rules of chess and there is no truly fair way to implement them without undermining the spirit of the game.

I dont want them and i don't take them. Mouseslip is bad excuse for sore losers.

I have them turned off. Too many players asking for too many take backs.

Also, I wondered if not being able to avail of them myself would lead me to think more carefully in the first place. It seems not though.

i always decline my friend to take back move because i want him to improve so he can learn to think twice before make a move ,and make next game better ..chess is about making mistakes ,if nobody makes mistakes every game would be a draw

I decline takebacks because I want to win more than giving you a second chance at your move.