I believe a self-written, properly tested paper wallet generator is MUCH safer that using whatever you can find on the internet now.
Compared to "whatever you can find", sure it can be safer but the choice is not between your own code and random code on github. There are other options such as well reviewed and well tested wallets such as bitcoin core and electrum that can be used to generate a key or mnemonic respectively then printing that on a paper which is way safer than your own code.