I agree totally that trust is one of the most important reasons for cart abandonment. However, your comment that
‘you can’t chase your customer down to remind them to purchase the items in their shopping cart, or try to persuade them to‘
..isn’t strictly correct. Following up on abandoned shopping carts with emails reminders is a very effective technique in recovering abandoned shopping carts

If you look at shopping cart recovery programs using this technique, you find that up to 50% of the abandoned carts can be recovered with an optimized program. Marketing Experiuments referred to these programs as "one of the simplest and most cost-effective marketing techniques that we have tested.”

There’s a free tool you can use here which will track abandoners on your website, and enable you to follow up easily. There's aslo a host of infoirmation, data and best practices on shopping cart abandonment on my blog here:here