In practice, the odds overwhelmingly favor abuse. And even if the "proper and lawful" version was somehow achieved, it would require constant maintenance, security, and expensive oversight that would also be at risk of degenerating back into abuse.
If abuse can’t be eliminated then it’s about what ratio of abuse to crime reduction is tolerable I guess. If we find 100 taken children while a dirty cop stalks his ex - is that tolerable? I’d say yes. If it became more abused I guess that’s when society needs to decide.
Abuse can be eliminated. It's called requiring a warrant. What's tolerable doesn't matter: we don't need to litigate how willing we are to bend the fourth amendment.