why is PSM not installed by default?

[Jonathan Wilson]

I notice a lot of people that post in various places saying "https 
doesnt work", "I cant get to xyz secure site" etc etc and half the time 
its because they didnt know that PSM needed to be installed.
Why isnt it installed by default?
At the very least, more needs to be done to make the "if you dont 
install PSM, you cant access secure sites" fact spelled out in plain 
language in the installer.