Read the article; the police absolutely do have better tools, but they are so terrified of leaving a suspected pedophile in a house with children that they do not wait for any corroboration before making the arrest.
They are so terrified of leaving a suspected pedo in a house with children... that they guarantee the safety of pedophiles and continued access to children in their care for weeks or months as they chase phantoms by not being careful. They protect the pedophile, and their mistakes endanger children while destroying innocent lives. There is a reason that child advocacy organizations actively oppose these sorts of raids where police go after downloaders and such. It does nothing to protect children, and is so alluring and easy for police officers that they neglect any actual useful efforts completely in favor of it.
You can either go online and claim to be a turbosexual 15 year old whose parents are out of town and bust anyone who shows interest and net 5 busts in an evening.... or you can investigate the most profoundly disturbing case of your career of parents abusing their own children for months and then get 1 bust. The police make the easy choice, and the kid getting abused by their parents (the absolute most common case by a country mile) gets no help. Child advocacy groups do not waver in their mantra: Education and empowerment. They are the only things that actually STOP child abuse. But they're not as flashy and quick and easy, and society generally doesn't want to educate or empower kids, so everyone just does what makes them feel good without thinking too much about whether it actually helps real children.