There are many things most likely to consider whenever you're investing money in crypto..
These are:
1. Volatility of the Market.
2. They don't have the knowledge about crypto.
3. Negative news that they see or hear in social media/TV Media.
4. They were scammed and afraid to invest again.
5. Threats of hackers in the internet.
But users can also protect their computer from hackers by using:
1. Virtual Private Network for Internet Protocol
2. MetaMask Wallet
3. Not saving any private keys in your PC.
I believe that this situation is caused by the usual and healthy fear of a person losing their money. After all, the crypto market always involves fairly large risks that every investor should keep in mind. But I am sure that over time the situation will gradually improve when an increasing number of people will understand the possibilities and advantages of investing in cryptocurrency.