Conceding after a bad mulligan is really bad. A good player always goes for their outs, and only when there is no possibility to win the game anymore should you concede.
No not a bad mulligan, when I mulligan all cards and I get exactly the same in return, from experience I know it is a lost cause, this particular game I am meant to loose. What you said I have tried, only to irritate myself. So I save the pain and time waisted, by just conceding :-)