Amos points to the root of their problem: 'For so it has pleased you, O children of Israel.'
The final phrase of the verse, 'For so it has pleased you, O children of Israel,' cuts to the heart of the matter. Their religious practices weren't driven by a desire to obey God's specific commands, but by their own preferences and what felt good to them. They had crafted a religion that suited their own desires, choosing places and practices that pleased them, rather than submitting to the God who had revealed His will.
This highlights a crucial theological point: true worship is rooted in God's authority, not human preference. Israel had substituted God's commands for their own traditions and innovations. They loved their self-made worship, and God declares that because they chose their own pleasure over His revealed will, their 'sacrifices' were nothing more than added rebellion.