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Because it's bullshit.
Wouldn't you be pissed if you wanted to go to a show but it was sold out because half the tickets were bought by scalpers who are now going to sell them to you at twice the price?
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You fail to understand certain basic facts.
First, scalpers often overestimate the demand for certain tickets. They are then forced to sell their overstock at a price *below* the initial market value. This happens all the time.
Second, scalpers increase the profitability of putting on a concert, which increases the supply of concerts.
Those points aside, the simple fact is that scalpers are engaging in completely voluntary monetary transactions of perfectly legal commodities, and that it is economically inefficient to restrict such transactions in any way whatsoever.
Anyway, read this:
Bastiat