Let me count the ways:
"Taxation is Theft"
tax
/taks/
noun
noun: tax; plural noun: taxes
1.
a compulsory contribution to state revenue, levied by the government on workers' income and business profits, or added to the cost of some goods, services, and transactions.
Levied = seize (property) to satisfy a legaljudgment
Here's my favorite part...
theft
noun
ˈtheft
1
a: the act of stealing
specifically : the felonious taking and removing of personal property with intent to deprive the rightful owner of it
b
: an unlawful taking (as by embezzlement or burglary) of property
So if Congress or a city council passes legislation establishing a tax they will have done so legally. Which is why if you don't pay it, you will be visited by law enforcement.
The law is specifically mentioned in the definitions of both "taxation" and "theft" so inferring that both of these terms are inclusive or somehow synonyms is not even true by the definitions of the words.
....unless, of course it depends on what the meaning of "is" is.
"taxation is coercive" makes more sense, but they won't change because they are dipshits. And if you wanna talk about coercion, we can talk about wages and corporate price fixing which is where the real theft is taking place. There is nothing nuanced, astute, or of any benefit to humanity at all about the nonsensical slogan of taxes being theft.
Checked bag fees are technically highway robbery though.