I think my daughter is dating a cuckoo.
Really, a cuckoo? What leads you to think that?
I saw couple of couple photos of her dating this guy who looks totally insane.
Who your kid dates is a huge concern, you care about what she is involved in like most parents. Wanting better for your children is fine, but let her choose her own men and have her learn from her own mistakes. She will resent you for interfering if you stop them from dating.
She has the worst taste in guys but I'm stopping her from living her life and I'm being a hypocrite. She needs to learn from her mistakes.
I understand you want to help her out, but yes like you said she needs to learn herself as long as she's not in physical or emotional danger. She deserves full reign of her private life and she would appreciate it for not butting in.