Do defenders blunder more than attackers?

Consider this quote by Rudolf Spielmann.  "Practical play adduces evidnence that errors occur far more frequently in defense than in attack."

It seems to me in my games it is the other way around.  How is it with your game?

i feel like the attacker blunders more often due to seeing threats that can be accurately defended but then going for them anyway

i agree with what you said.  

This makes sense to me.  Which means, I must be bad at calculation since I blunder more, it seems, when I am attacking.  

There is also the element of pressure.  When a player is on the defense the pressuring player is severely limiting his potential number  of strong moves. As an example compare a player who moves his knight back and forth to and from the starting square, as he is putting no pressure on his opponent. His opponent has virtually unlimited good options.  But if something new is constantly being threatened with each move, it is by comparison much harder to find accurate moves to hold a defense. So pressure is simply putting constraints on your opponent that they have to suffer through, which in turn will make them more likely to blunder and lose the game. This concept is applicable to a wide variety of strategy games in addition to chess.     

Attacking generally comes from a superior position, meaning that the attacker will have more good options available than the defender.

Superior positions generally are achieved by superior players, meaning that they'll make fewer mistakes.

In aggresive attacks ,defense is sometimes sacrificed or overlooked.  I find weakness and try not to get rattled.

It's just more obvious when a defender blunders.  When an attacker blunders, he loses material, but when a defender blunders, he generally loses the game more or less on the spot.

I think I agree with the statement. A "blunder" when attacking is actually not necessarily a blunder. It's more of an inaccuracy or a mistake. It isn't game losing -- but you missed an opportunity. Therefore, not a blunder, but a mistake. Totally blundering everything when you have an attack (meaning you have the initiative, etc etc) is very very slim. Usually only one move gives everything away.. While all others either a.) do nothing or b.) win.

On the other hand however, when you "blunder" on your defense, it most certainly is game losing. Also, when you are defending, there is usually only one or two good moves, and all other moves fail! It is much more common.

Simply, attacking blunders are just missed opportunities. But defense blunders are totally losing.

I think attackers "blunder" more than attackers. Making a blunder means missing an opportunity to change the position in a way that is beneficial to you. Defenders, however, are more accurate in keeping themselves safe, rather than attacking and losing your positional advantage. Defending your position sometimes can be losing, especially when you miss a mate or a chance to be winning in material or position. So, either way, both  attacking and defending can be losing and winning at the same time.