[Nidsstese]

If its indeed a theft, I cab think of the only reason why Ulema do not speak against it, is to avoid people from getting into trouble by not paying. Governments are very quick and hard to persecute individuals who have tax dues and do not pay. They can be heavily fined and jailed or both.

Again if this is categorised as a theft in Islam, then we should be able to use the interest that gets generated in bank accounts to pay for it, however, there is fatwa against paying taxes with interest money. So in a sense Ulemas do not believe that paying taxes is a theft!