Basically, Ripple is based on Trust; and Trust is the greatest liability of all.
I fail to see your point. The majority of bitcoin transactions are based on trust.
To back this up with some facts:
https://blockchain.info/charts/estimated-transaction-volume?daysAverageString=30 <-- 30 day transaction volume on the block chain.
http://bitcoincharts.com/markets/ <-- there are 4(!) different active closed source centralized purely trust based exchanges that have several times that volume alone, not counting others and not counting the volume that comes from sending money to and from these exchanges. Also not counting brokers like Coinbase or BitPay.