What does dreadful but nesscary mean?

"It is dreadful but necessary" ("Cest affreux mais nécessaire"), from the Journal d'Autre Monde, 1794. ... This was a commonly held belief in 1793-1794 when the guillotine was a means of purging France of those who were deemed a threat to national security.

I think dreadful means something in dispersal or negative feeling like for example "his last words were very dreadful for the family".

c. typhoon

hope this

living during the great depression had a major affect on the mentality many people. a good portion of people who lived during that time do not trust banks. this is likely the result of the many widespread bank failures in the 30s that caused people to lose their life savings.