Are Unencrypted Keys Dangerous? MyEtherWallet Security Concern

I set up a wallet through MyEtherWallet, and plan on using it as a paper wallet.

My concern is that it gave me my unencrypted key. Using only this key, I can access my wallet and send a transaction with no password whatsoever required.

This seems very dangerous. Is this normal? How can paper wallet users feel secure when copy/pasting a key can access the ETH without having to input a password?
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