In political philosophy, responsibly hinges entirely on one's freedom, if this freedom is not whole, then we cannot reasonably hold the individual to the same degree of responsibility as others: as is written by thinkers such as Sartre, who wrote about free will
Henceforth, if an individual is unable to fully act out of their own free will(in this case because of their mental disposition) then they can't be held to the same level of responsibility as another(in this case, sane) person
For example, if someone deeply autistic like cheater was to say something odd most people would write it off as not fully meant by him, but if someone with a sane state were to say the same thing, more people would be put off by it
This is because of something known as "variables", meaning not every case is the same or that it deserves the same answer
Due to this, people like sevens and shondo can't be fully held responsible for everything they do, regardless of how you feel about it
Sevens is not a manipulator, rather, he is a prime target for manipulation. It is likely that the people targeting him now are the manipulators and groomers.
Hope this professional perspective on the situation helps