If you decide to download a wordlist, ensure you're obtaining it from a reputable source and that you're not violating any laws or terms of service.
Creating your own wordlist can be more beneficial and ethical than downloading one. You can tailor it to your specific needs, ensuring it's used for legitimate purposes.
The existence of these lists is why and long, unique passphrases are essential. If your password is on a common .txt wordlist, a modern computer can "guess" it in less than a second.