A deposit doesn't even cover the legal fees to evict a tenant (which can be north of $10,000 between lawyer, filing fees, and so on).
Add to that loss of rents for multiple months (while the landlord has to pay mortgage, insurance, taxes) and damages to property, and now you're asking a landlord to pay tens of thousands of dollars of their money.
Add to that loss of rents for multiple months (while the landlord has to pay mortgage, insurance, taxes) and damages to property, and now you're asking a landlord to pay tens of thousands of dollars of their money.