Insiders know their own affairs best, and Duge did far more than Gao Yong and the others could imagine.
Throughout history, there has never been an existing power that was willing to witness the rise of a new power.
The cake is only so big, the rise of a new power would inevitably shake their interests.
Besides, Duge was stepping on their faces and digging at their corners to rise, which is something no one would tolerate.
Justice and morality?
They are but whims of those with the biggest fists.
If it were just Duge alone, the problems that Gao Yong and the others were concerned about would indeed be issues. No matter how strong one's personal martial power is, it cannot contend against the whole world.
Duge could kill one expert, two experts, but that would be about it, once the three sects and five factions react, he alone will not be able to protect the Peacekeeping Gang.