You should really make it 420 reasons...

EDIT:

I'm not gonna read through yours but here we go I'll see how many I can do.

1. The law was based on racist beliefs of Harry Anslinger and congress in general.
2. There have been zero recorded overdoses from cannabis ever.
3. Alcohol kills more people than cannabis, a mind-altering drug that is legal yet is much more harmful than cannabis.
4. Keeping cannabis illegal creates a black-market situation where the industry is untaxed and controlled by violent gangs.
5. It truly brings out the peaceful side to people, unlike alcohol.
6. The people have spoken, Obama's website Change.gov had an "open for questions" section where people could submit and vote on ideas they would like implemented, and the NUMBER ONE idea was regarding the legalization, regulation, and taxation of cannabis to create a billion dollar industry right here in the U.S.

That's enough for now.