The phrase "someone cannot/can't help it if" is often used to describe a situation where a person is unable to change or control a certain behavior or circumstance. There are several alternative phrases that can convey a similar meaning. One option is to say "it's beyond their control," indicating that the situation is out of the person's hands. Another possibility is "it's not their fault," which suggests that the person is not to blame for the situation. "They have no choice but to" is another way to express the idea that the person is powerless to change the situation. Ultimately, there are many ways to convey the idea that a person cannot help a particular behavior or circumstance.
