A Bitcoin can be lost very easily if people don't care. Most people have a hesitation to look into Bitcoin's complexity and stay off instead because of fear of losing money.
But it's not a problem of Bitcoin, it's a problem of digital money because it's very easy to lose. If you have a Dollar, you can be sure to have it but having a Bitcoin is much more difficult because it's digital and it needs to have some research before using it.
We need a lot of good information material how to store Bitcoin safely, paperwallet, cold storage, private key, public key, not on exchanges, always check address before sending.