Whilst I can't disagree with that in total, Spurs fans have walked out on mass on the 80 min mark in too many games I care to remember, especially those games at Wembley. There is now pressure to remain when thousands leave the stands early, when we lost the FA Cup semi-final 5-1 vs Chelsea, I was the only person within 20 rows of me, determined to sit it out I felt defiant, then I got an overwhelming sensation that I could be filmed, the twat sat on his tod, looking depressed screened live around the World and turned into an internet meme, so I legend it, couldn't get out of the place fast enough.
Unfortunately no-one will get that song after a missed pen, Ade was crucified for missing his, no song started when Kane missed his at Liverpool. Those days are long gone I'm afraid, the intent will be there from many fans, just they are the minority now, the vast majority are already filing down Wembley way.