No, I have to send a simple forged "alert" packet to cause you to download 1-4MB of block data plus additional dependent spend data of similar size from your pe

No, I have to send a simple forged "alert" packet to cause you to download 1-4MB of block data plus additional dependent spend data of similar size from your peers, and lock up your CPU for an intensive amount of time doing signature verification and hash tree calculations only to find out the alert was incorrect. Meanwhile another spoofed peer sends another alert packet....