I don't "believe" helmets do much good, and the data behind helmet use is mixed, but it's time to replace this one. Why?

I look at helmets as lawyer repellants. The insurance company's lawyers, or lawyer for the jerk who runs into you, the first question coming out of their mouth will be, "Were you wearing a helmet?"

Wearing this helmet with cracks will let them argue, "The helmet wasn't being used according to manufacturer's instructions, which say replace after every accident, so it's the victim's fault his leg ended up broken. (A subsequent review of the original TRT data showed no significant reduction in head injuries with helmet use, but did show that helmet use was associated with a reduction in leg injuries.) Especially since OP posted a picture.

No, it's time to replace the damaged helmet so your magic defense against attorneys remains intact.