There are valid arguments that the market come backs are not simply happens b/c investor suddenly jump into stocks!
Most famous one was "David Tepper bottom" when he said "there is FED put under the market and it is safe to buy stocks." (if I remember correctly)!
PS: this is the link: http://www.cnbc.com/id/39341388
(it is good to watch this clips again, it reminds not to fall into emotions)