People should use safer browsing habit and along with that should diversify their bitcoin and altcoin holdings in as many places as possible.
Exchanges, online wallets and hot wallets in gambling sites.
If you are not using it regularly, you can just export the private key in encrypted form and remove every trace of its existence.
Totaly agree with diversification.
But people may diversify in different wallets and split amounts, and at the same moment keep all the passwords from diversified locations in one place. If hacker gets access to this place he/she can take all diversified funds at once.
Also Must have different passwords for each service or wallet, etc.
I would also recomend to keep info encrypted on several offline pendrives and access them very rarely. Plus one more diversification is hardwallet.