Barrier: They might do something wrong.

Solution: In most cases it’s very unlikely that someone could make the situation worse. As long as they are safe, it’s always better to try and help.

Barrier: They might get sued.

When someone is acting in good faith to try and save someone's life or to prevent further injury, there is very little risk of them being sued.

Barrier: The situation could be dangerous, or a trick.

Solution: They shouldn't risk their own safety. If they don’t feel safe, they could call 999 for emergency help.