Because you see where blindly following your instinct judgment, (even when conservatives glued arguments to them) got us. It might have been a good survival trait for ten thousand years - but the last 200 years, they almost got us killed.
So you become liberal- because you know your limits, you know how little you know, how wrong you can be, and how easy it is to stomp what could feed your family tomorrow into the ground - just because they didnt liked the color.<p>And yes, there are conservatives &quot;technology investors&quot; who dip there toe into tested tech and distribute it. 
But they are never the guys to fling themselves out into the void without safety net.<p>The reason why i have become a liberal - though raised by extremely conservative parents- is because i was so wrong, so often back then.
Its not the usual youth rebellion to conservative realism dichotomy, quite reverse, the longer i live, the more i realize how destructive one can be with how little - and all that just for some retarded irk in my guts, that kept a monkey alive 20000 years ago? Better control that irk and let that strange guy in my neighborhood build his steam machines in the middle of the night.