Title. Rescue has its uses, but sometimes it can do more harm than help for a player, such as interrupting casts or sending them into an AoE. While Arm's Length/Surecast allows for temporary protection against an unwanted use of the skill, it is not always up for situations that such might happen. Sorry if this has already been posted before.
Counterargument:
A toggle permanently disabling cast of Rescue on a given player could present the following problems: It could prevent the healer from saving certain players in danger, or make it harder to find and report those that abuse the skill.