All of it starts with our own and that also requires awareness from us.
If we find it then it is better to give advice to our friends or family do not follow the ICO SCAM.
You can't. Money always had scammers and no matter what you use there will always be scammers. For example there was scammers during roman times as well, they tricked people to take their money and run away with it, 2000 YEARS AGO! There was a dude that sold the eiffel tower in paris as, there was american dude that sold empire state building.
These were all with fiat currency we use everyday. Now bitcoin has scammers and yes it is much easier to actually scam people with bitcoin because technology improved everything, it is easier to communicate with other people thanks to improved tech but that allows people to reach a global audience when they want to scam people and not stay just local.