Why is that? Likely because you’ve been conditioned to fear other drugs more than alcohol.

It’s rare but untreated opiate withdrawal can kill - “Between 2013 and 2016 there were 10 people ranging in age from 18 to 49 years who died from heroin withdrawal in a U.S. jail.” - https://www.addictionresource.net/heroin/withdrawal/deaths/

Untreated alcohol withdrawal is likely to kill.