Passage:

The town newsletter announced the new recycling program in careful language. Residents were invited to participate, encouraged to ask questions, and reassured that mistakes would be forgiven during the early weeks. Yet in a separate flyer slipped under doors the same evening, the council warned that bins left incorrectly would be tagged and repeat offenders fined. Some readers described the rollout as welcoming; others called it threatening.

Which word best explains why readers formed such different impressions?