So, the question is, why, in a platform that is pro freedom of speech, some people against edit?

When we edit, the original message is still there and available...

I don't get the issue behind.

Freedom, for me it's letting all possibilities available, and everyone decides if they are going to use it or not. Not allowing is restrictive.

Is like when you make a mistake, you refuse to make things right, because it's simple not to go with the trials of making things right ?

Unless, there is a "code" issue I am not aware, in that case, can I be made aware of it? 

 The issue is centralization; a protocol is the definition of restrictions, constrains that enable interoperability. All protocols work like this, TCP, ICMP, IMAP and driving on a highway.

The more complex a protocol is the harder it becomes to implement it, thus the harder it becomes to remain interoperable and decentralized. 

 Wut?  Nothing in nostr prohibits an edit.  It fact, it's THE killer feature.  Not everyone has realized it yet, but it's good that some are starting to. 

 Genius post.  Made me stop and think.  You are right. 

 I tend to lean towards the edit option now that my n key is sometimes not working.