When it occurs, the money to pay the taxes is tied up in the business. A voluntary sale, on the other hand, is at a time of your choosing, and the money from the sale is on the table to pay the resulting capital gains taxes. And of course, the taxable value of a sale and the amount of the taxes that are payable is certain and known prior to the transaction, not months or even years later. That is why capital gains taxes don't force companies out of business, but the death tax can. There are few provisions in the tax code that force successful companies out of business.
Few provisions tax involuntary actions or events.
The death tax is one. More often than not the death tax actually kills the company soon after the owner dies. And I remind you again, don't lose sight of or underestimate the costs incurred by people trying to make reasonable and prudent preparations just to pay the tax. It is clear that momentum has been building for death tax repeal. I urge you to eliminate death as a taxable event.