Without players like Fisher and Horry, no way Shaq and Kobe win those three titles together. They probably would only win one of those (the easy 2001 Finals). The Lakers barely beat Portland in 2000, and barely beat Sacramento in 2002. And it was because of clutch players like Fisher and Horry. Every team needs role players that are not afraid to take the shot.
And then there's so called "stars" that wimp out late in the game. We make fun of LeChoke too much so here's another example: