[ungamedplayer]

The reason you sanitise input is because the data can attack the host and the client.

This post has a narrow view on attackers.

[sfvisser]

It’s really not. The point is that sanitizing output is a better way to protect the host and the client.

[worthless-trash]

Sure, keep writing exploitable code then, have fun!

[cowboylowrez]

yes, and the article clearly agrees with you, different destinations of the data have different escaping requirements.