90-93% of Americans take a Standard Deduction ($12,550 for Single filers, $25,100 for MFJ)
If you have a reason to deduct a bottle of ketchup or a pair of shoes the Code more than allows for it, it encourages you to do it.
I personally deduct bottles of ketchup every year for every hotel I own. I never have deducted a pair of shoes but I would assume those in the trade or business do annually.
PS: Any person that takes a Standard Deduction does so because that amount is GREATER than any itemization deductions they could otherwise be able to compile. The SD is essentially the 0% income tax brackets that idiots like AOC don't understand the US already has because it means the first $12,550 Americans make is NOT included as taxable income. If you took the standard deduction away or lowered it to Obama era levels you would bring in very little tax revenue. All it would do is make poor -to- middle class filers owe more income tax and spend more money on accountants and lawyers trying to itemize as much as they can. It would also make the IRS spend more money on man hours trying to enforce the Code. Americans would spend more money and pay more in taxes AND the Federal Gov. would spend more money on the IRS than it made in additional tax revenue. The only people that would make more money are the mega accounting firms, the tax software companies and tax lawyers....even as a recovering tax lawyer I don't like this option.
Not sure what cheating you are talking about since self employed filers are by far and away the most taxed group of Americans.
Unlike employed filers, SE filers are paying their social security and medicare to the Fed by themselves AND on top of that are paying the workers comp entirely by themselves.
Self Employed filers are (again) the by far and away most most likely to be audited. So the amount of "cheating" the filer does is up to their own personal risk assessment...
But let me speak on behalf of all single filers, being able to "cheat" by using $30 worth of toilet paper, hand soap and tabasco sauce out of my $600 business expense deductible Sams Club bill isn't worth the ~15-25% more in tax that I pay compared to an employed person with the same income.