Who cares, if taxable income is to be declared and taxes to be paid then it should be done, that will be the law for all law abiding people, just like it is in most countries.
Then the govt will have more revenue to improve govt services and infrastructure to upgrade Thailand to version 2.0 so it can be like Western Europe or Singapore.
Suggest the govt also introduce fines, penalties and interest for not submitting tax returns if income was to be declared.