As we have just discussed in the C++ room, the current tag synonym system has one "security flaw": It is possible for a minority (5 users with a score of 5 in some obscure tag and 2.5k rep) to "hijack" a popular tag with thousands of questions. Doing so would certainly cause utter confusion, but my take on it was that, if they succeed, they have thousands of high-rep users in their tag when they only need a few downvotes to reverse that prank.
However, this answer by Nick Craver seems to imply that, once tag
A has been made a synonym of
B, all questions with the tag
B will actually be changed to to have
B instead, rather than just displaying tag
B. If I understand that correctly, then this seems to be an invitation to wreak havoc on such a large scale that I have actually considered whether I should post that here.
Please tell me I'm wrong.