Intuit, the company that makes Quicken, QuickBooks, and several other pieces of financial software* has decided that guns are icky and they want no part of them.
Give them what they want. Use something else.
Update: Linoge reminds me in the comments that they also make TurboTax. Might I suggest some H&R Block Tax Software instead? My taxes are generally more complicated than the average person, so I have an accountant do mine.
*They also have a mortgage unit and a web hosting company.