People are giving answers to your specific hypothetical, but on a higher level, the answer is simple. The government likes having more money. Once a tax is in place, it becomes the new normal. It can be like pulling teeth to make a government roll back a tax. Groups in my local area have tried numerous times to roll back a specific tax where a government spokesperson has even said the tax is no longer fulfilling the original purpose, but removing the tax would now affect the overall budget. That has become the reason they refuse to remove it, and because neither party cares much about removing it, there’s no political leverage by the voters who care about it.