How? Murali has a similar record in the WCs and he played for a significantly weaker team.
We weren't a weak team back then , during Murali's era we won 1 World Cup and made 2 World Cup finals out of 5 tournaments.
Murali got his wickets because he was talented, not because of the team he was playing for ..
Nobody can score your runs or take your wickets for you as a batsman or bowler, you earn it through your skills.
Australia were strong because they had players like McGrath, not the other way around.
Australia won 3 World Cups , and McGrath's 71 wickets @18 was a major contribution to that.
In World Cups that Australia won with Mcgrath, these were his figures in each successful campaign:
1999 - 18 wickets @ 20.39
2003 - 21 wickets @ 14.76
2007 - 26 wickets @ 13.76
Three World Cup-tournament winning performances across 3 different continents ..
Consistency,Quantity,Quality,Variety.