Honestly Fugo has a point there. By betraying the boss they are basically putting a huge target on their back. The boss can just kill them then kill Trish anyway. The best thing they could've done was letting her die then biding their time before striking back on the boss.
But they have anime...
That dedication towards the boss is honestly scary. What has the boss done for the members of the gang that the members are ready to kill themselves for his orders?