Unless everyone has an evil twin, there is less chance of everyone wanting to exit X at the same time. Hence there won't be a run on X. Moreover, if my evil tw

Unless everyone has an evil twin, there is less chance of everyone wanting to exit X at the same time. Hence there won't be a run on X. Moreover, if my evil twin a) owned a managed fund or b) sold in a slightly smarter way, then they would lose less on X due to liquidity. Moreover, the hit on Xs price also has a slight hit on the ETF value. Hence there is a small positive feedback loop.