It's about "investment": People spend a lot of time, consciously on purpose or implicitly as a matter of consequence, on making up their plans & preferences.

They've been building up mental velocity to whatever they're going to do.

When you give them a contradictory opinion or advice, you're asking them to discard that investment and abruptly switch directions.

Instead of asking them to drive off their mental road and into the dirt or turn around, offer them something akin to a rail track that they can gradually/subtly switch onto.

Figure out the right "prompt" for them :)