It's easy: if you want to grow the economy, encourage job creation, and increase federal revenue, you support making bonus depreciation permanent. Permanency gives job creators the certainty they need to plan and invest in their businesses, including hiring employees.
Business people do two things with their time fundamentally. The first is that they try to create sales, right? Revenue, key to business. But the other thing they devote their time to equally is cost containment. That is to say, how to not create jobs. Because the fewer jobs you can create for the revenue you create, the more profit you make.