so cruel is the man that he never shows any mercy to (those

so cruel is the man that he never shows any mercy to (those are,those) against his opinion
请问这里为什么是those?
类似的还有
for ( )interested in getting online,the school offers an internet bar.
请问those是有什么固定搭配之类的吗,为什么它后面的动名词或介词· 之类的可以不用be动词