Sivis began using words to make these subjects understand their own importance — he not only provided them with work, but he was also their only hope of being safe from the monsters!
After that...
"The time is right — kill that Blood Clan figure, and use the exclusive 'Call Guardians' skill obtained from the Extraordinary Soul to summon monsters from the territory, to hold off a wave of Blood Servants."
"It should be able to increase loyalty even more, and also help these people get over their fear of monsters."
As for what if the Blood Servants don't attack the factory?
That's impossible.
Sivis was certain that, as the number of Blood Servants kept growing, they would definitely attack places like the factory, which gathered a large number of people.
At that time, a group of monsters with Silver-Rank strength and immune to infection would be like tigers in a flock of sheep, slaughtering all the monsters without mercy.