That's one big textwall you got there... Really... I had to make an extra effort to keep reading, but it was very hard to extract the exact meaning of your post...

Am i correct if the TL;DR; version of your post is:

• you say you are sorry for plagiarizing with an account with 41 posts that's little over one month old
• you think plagiarism rules on this forum are to harsh, and think they should change

Plagiarism is a serious offence... In my country (as in most other developed countries), plagiarism can get you fired from your job, thrown out of school, cause a university to take away your degree or even land you in jail.
On bitcointalk, the only sentence you get is being banned from bitcointalk (as a person, you are not allowed to make new accounts either, unless it's to create 1 topic in meta for the sole purpose of discussing your ban). As a whole, such a ban is actually a light sentence... IRL you could have lost your job, get thrown out of school (or uni), or even land in jail....

As for the admin being harsh: actually he's pretty lenient (IMHO). He is even known to lift bans for people that have actually contributed a lot to the community for single acts of plagiarism a long time ago, followed by a long time of being a productive member.
You're free to make your case tough... Good luck!