Well first of all - we are not talking about this deduction within the context of a full over haul. I would be in favor of that. But that’s apples and oranges, so you’re missing the point completely.
Second of all, airplanes themselves are 100% tax deductible as business expenses, so there’s no need to deduct the interest. Same for many cars and I would suspect for a good number of guns.
The coin collection is ridiculous. How many people take out a loan on a coin collection? Gimme a break.
Next?
...and for that matter, how many folks take loans out on guns? Straw argument.