i have to agree with you totally that this is typical human behavior
But is not only linux, it's everything !
Global Warming has been mentioned over and over for over 50 years ! Now, the new generations are thought to be more conscious, but still BIG OIL MEGACORPS want to keep drilling, governments start wars, etc.
We didn't care for wildlife till many species got extinct!
We didn't care for the ozone layer till skin Cancer cases increased dramatically.
We didn't care for Road safety till thousands upon thousands have died in "preventable" accidents..
Educating the newer generations to take better choices is the Key, plain and simple.
It's harder to show old dogs new tricks, teach the young ones or whom really want to learn.
People who Choose FOSS are also more responsible with other Human beings, with our society, think more in the planet and in the future of Human Kind.
FOSS is the right thing to do.
and like @smartboyathome said, get the word out gently so people don't get scared away.
i too get scared of "aggressive preachers"