Why do they want to destroy Bitcoin? And how would a 2MB block size accomplish that?
Certain people stand to lose a lot if Bitcoin succeeds to become mainstream. This has nothing to do with the 2 MB block size limit. You need to look at the bigger picture. However, this is off-topic here. There are other places where you might find relevant information.
"Certain people" is not specific. Are you afraid to name names or are you just full of crap and spreading FUD?