Kononnya, it was not intended to send any sinister message to Malaysians of other races.
Then he goes on to accuse those who felt anxiety over the keris waving last year of having a backward thinking and understanding of their culture.
let Lulu take you back to another time and same space. Maybe you were too young to remember. Or too busy Skrine&Co-ing.
Well, your cousin not just waved a keris, he was talking about soaking it with Chinese blood.
One oft-cited instance of this is a rally held by UMNO Youth shortly before Ops Lallang in 1987, where future Deputy Prime Minister and then UMNO Youth Chief Najib Razak threatened to bathe a keris (dagger) with Chinese blood. source : Wikipedia
At the same rally, banners were hoisted carrying phrases such as "revoke the citizenship of those who opposed the Malay rulers", "May 13 has begun" (referring to the May 13 racial riots in 1969), and "soak it (the keris) with Chinese blood". 
Lulu give you another example
On Feb 4, 2001, the Malay Action Front (MAF) organised the "Takkan Melayu Hilang Di Dunia" rally at the UMNO-owned Putra World Trade Centre. There were blood-curdling posters and banners with the Malay keris in a sea of blood. Yup, the logo of the gathering was an outstretched hand holding a "kris" (the traditional Malay dagger) set against a red backdrop with the words Melayu Bersatu (Malays Unite)
source : http://pemantau.tripod.com/2001/10Feb_ghafar.html
Yesterday, at the Umno Youth Assembly, you said
“The keris is not a symbol of colonisation, oppression or exploitation ofsource : Malaysiakini
non-Malays,” he claimed, saying that it only embodies the hopes and aspirations
of Malays to be attained through the struggles of the party.
Looking at the history of the keris this past 10 years, it's telling me different.