Why not?
(1) A Financial Transaction Tax (FTT) makes sense for a number of reasons:
Revenue: An FTT has the potential to generate an estimated $80 billion to $300 billion in revenue every year
Precedent: Four of the top six countries on the Heritage Foundation's Index of Economic Freedom are Singapore, Hong Kong, Ireland, and Switzerland, all of whom have financial transaction taxes.
Fairness: Securities traders pay no sales tax, and their SEC fee amounts to just $22 on every million dollar purchase. That's two cents on every thousand dollars. And even that goes to the financial people, not to the public.
Freedom of contract. We sell them guns that kill them; they sell us drugs that kill us.