When someone takes Cleanse against Malzahar

I did it once. It hurt ;_;

Ah, we all remember the first time we tried to cleanse Malz

http://www.reactiongifs.com/r/2013/09/danny-oh-no.gif

When I'm playing Malzahar and I see the enemy laner take Cleanse:

https://m.popkey.co/85e13b/KMWQ8_s-200x150.gif?c=popkey-web&p=mars&i=3musketeers&l=search&f=.gif

In all honesty, I don't understand why an item ( ) can be more effective than a summoner spell ( )