Others accuse me of being selfish when I say "No" to their requests after htey have never granted any request of mine.
I've also learned that it's "selfish" to request that someone smoke outside; yet it is not selfish for one person to stink up an entire house with tobacco smoke.
It is selfish to keep one's hard-earned pay to one's self and become wealthy; but it is not selfish to be a lazy, good-for-nothing parasite who steals and lives off the well-being of others.
So I'm selfish. Big, fat, hairy deal! 
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.