system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] why would the collector attempt to collect the infinity stones? He must knows Thanos is after them and would kill him for them!
gpt
The Collector is immortal, an elder of the universe in the comics.  He is also quite powerful in his own right.  He doesn't necessarily fear Thanos the way most people would.  Further, he lives for one reason only to collect.