2 Added a source explaining why red is a good color for an irreversable action.
source | link

Users are more likely to think twice before clicking on something that is red. For which one of the two options do you want them to think twice before clicking?
Which one of the two choices will potentially trigger more irreversible events?

Source: http://en.wikipedia.org/wiki/Red#Warning_and_danger

Users are more likely to think twice before clicking on something that is red. For which one of the two options do you want them to think twice before clicking?
Which one of the two choices will potentially trigger more irreversible events?

Users are more likely to think twice before clicking on something that is red. For which one of the two options do you want them to think twice before clicking?
Which one of the two choices will potentially trigger more irreversible events?

Source: http://en.wikipedia.org/wiki/Red#Warning_and_danger

    Notice added Citation needed by JonW
1
source | link

Users are more likely to think twice before clicking on something that is red. For which one of the two options do you want them to think twice before clicking?
Which one of the two choices will potentially trigger more irreversible events?