I generally don't agree with your premise, that it's unfair to advantage homeowners in the tax code. I think society as a whole benefits from increases in home ownership (homeowners are stakeholders in neighborhoods). I think the tax code can either be simple or effective.
You are free to disagree at length with both of those beliefs and I won't fault you for doing so, except that if the best argument you can muster is "no fair, I just want to rent" I may roll my eyes.
But the thing I really wanted to point out is, there are 104905480 things we can debate on HN where a change of perspective might be productive. This isn't one of them; the mortgage interest tax deduction is a psychological pillar of the middle class of the US and eliminating it would be painfully disruptive to huge numbers of voters.
Narcotics will be decriminalized nationwide before we lose deductible mortgage interest, is my prediction. People have strong feelings about drugs, too, but the decision to legalize them or not doesn't change whether they can still afford the cable bill.