Washington Mutual wasn't just a large bank failure, but it was also one of a large number of other banks that failed at the same time.
During that time, a lot of other huge financial institutions were bailed out "under the table", and were not allowed to fail. Sometime by buying their crappy assets, sometime by rescuing their counterparties (e.g. AIG).
Let's hope SVB is not the start of a large wave of failures.