in a practical sense it's an absurdly low risk on a commercial flight compared to many others.
By comparison to what other acts on a commercial flight, can the risk of a liquid bomb be described as absurdly low?
In respect to practicality there are numerous cases of home made bombs causing carnage as well as others that were either thwathed (shoe bomber) or failed to detonate through a quirk in how the bomb was mixed ( july 21st bombers x 4)
Mickjoebill