Question

In the last line the writer talks about the good protestants to

Answer 1

Refering to The modest proposal
I believe the answer is: criticize the growing influence of the Catholic population 
The writer criticized the Catholic population took advantage of the absence of the christian population at that time.
He stated that these people were only a pretender that hoped to gained influence from the Kingdom.

Answer 2

Criticize the growing influence of the Catholic population
hope that helps