why did the SP500 double top but not other indexes ?

in 2007 a lot of people were writing about the possible double top forming
in the SP — i discovered lately
at first i thought it was only the SP that double topped but also found Dax
30 and Cac 40 also doubled topped, but not the other major world indicies
i looked at

if any index were to double top i'd have thought it to be those with the
relatively small quantity of stocks - Dax, Cac, but not the 500 stocks in the
SP index, and then there's the DJIA which also didn't double top

so why in particular the SP500 ? did it have anything to do with the P/E ratio or
emini trading ? why the SP500 index/stocks/companies and not the Russell 2000 ?
 
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