It's not really about taxes, it's about control.
That said, I actually am in favor, in principle, of an online/mail order/etc. purchase to be subject to sales taxes to the amount of half the normal rate of each of the provider's location and the purchaser's. Using mail/internet order to avoid sales taxes hurts local businesses and generally forces the sales tax rate up to account for the transactions that avoid the tax.
However, from a practical standpoint, this won't work as things currently stand. The problem is that there are too many different taxing jurisdictions and the rules on what is or isn't taxable vary between them as much as the rates themselves do. It's too much of a burden for the seller to accurately collect and remit those taxes.
This would only be feasible if there was a uniform definition of what is or isn't taxable, and that the rates (and collection points) were set at the state, not county or local, level.
I agree about control; so why should I with my own money be forced to contribute more to the the governments private checking account?