a mate in 1 that I am surprised to read that a lot miss

[Uri Blass]

[pgn]
[Event "Lichess Bundesliga Team Battle"]
[Site "https://lichess.org/ZF0pIW1Z"]
[Date "2022.11.17"]
[White "ChSalas"]
[Black "DrNyktersteinizchata"]
[Result "0-1"]
[UTCDate "2022.11.17"]
[UTCTime "20:35:07"]
[WhiteElo "2518"]
[BlackElo "2542"]
[WhiteRatingDiff "-5"]
[BlackRatingDiff "+5"]
[WhiteTitle "FM"]
[Variant "Standard"]
[TimeControl "180+0"]
[ECO "C40"]
[Opening "Latvian Gambit Accepted: Nimzowitsch Attack"]
[Termination "Normal"]
[Annotator "lichess.org"]

1. e4 e5 2. Nf3 f5? { (0.29 → 1.65) Mistake. Nc6 was best. } (2... Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. Re1 Nd6 6. Nxe5 Nxe5 7. Rxe5+) 3. Nxe5 Qf6 4. d4 d6 5. Nc4 fxe4 6. Ne3?! { (2.12 → 1.23) Inaccuracy. Nc3 was best. } { C40 Latvian Gambit Accepted: Nimzowitsch Attack } (6. Nc3 Qg6 7. Ne3 Nf6 8. Be2 c6 9. O-O d5 10. f3 Be7) 6... c6 7. c4 d5? { (1.52 → 3.07) Mistake. Qe7 was best. } (7... Qe7 8. Be2 g6 9. O-O Nf6 10. Nc3 Bg7 11. Nc2 O-O 12. Bg5) 8. cxd5 Bb4+ 9. Nc3 Ne7 10. dxc6? { (4.07 → 2.42) Mistake. Bc4 was best. } (10. Bc4 O-O 11. O-O Kh8 12. Nxe4 Qg6 13. Ng3 Nxd5 14. Nxd5 cxd5 15. Bxd5 Nd7 16. Bd2 Bxd2) 10... O-O?! { (2.42 → 3.89) Inaccuracy. Nbxc6 was best. } (10... Nbxc6) 11. c7?? { (3.89 → Mate in 1) Checkmate is now unavoidable. Qb3+ was best. } (11. Qb3+ Be6 12. Ng4 Qf7 13. cxb7 Bxb3 14. bxa8=Q Nbc6 15. axb3 Qxb3 16. Rxa7 Rxa8 17. Rxa8+ Kf7) 11... Qxf2# { Black wins by checkmate. } 0-1[/pgn]
This is from lichess.
I am surprised that this game happened relatively often also for other reasons:
1)Why do strong player play the dubious 2...f5 in blitz?
2)What is the reason that they play the inaccuracy 6.Ne3 that is against chess principles(not to move the same piece twice without a good reason)?

If you ask what I mean by relatively often then I find
15 blitz and bullet game for the position before 11.c7 when the average of rating of the players is above 2500 and total number of 77 blitz and bullet games(and in many of them white blundered mate in 1)
.

[Wisely]

Play slowly. Quickly to conserve time on the clock is not always best. My coach told me so before in the World Open back in Philadelphia. 2003 if I recall.