which might result to the child being bullied in school or kidnapped by criminals who accessed all personal informations online or even digitally kidnapped

These, to me, seem to be the only solid concerns here. Each one can be evaluated statistically using actual data to figure out the probabilities of them happening. For me, personally, my kids are schooled at home (strike 1), the likelihood of kidnapping is statistically low where I live and the data on where we live is public anyway, regardless of what we post (strike 2), and the concept of being "digitally kidnapped" is kind of silly to me as everything shared online is no longer controlled by you unless it's fully encrypted so this is just an expectation problem (strike 3).

As to child pornography, why would parents be sharing pictures like that anyway? I share everything publicly and openly because I feel my expectations are aligned with reality. If someone were to misuse content I posted in a way that decreases my wellbeing or the wellbeing of my family, I would adjust my actions accordingly. That has yet to happen, and I've only positively benefitted by having memories online.

As my kids get older, I definitely take into account their consent when taking videos or pictures. Often, they are the ones asking me to do so. When they are younger and can't give consent, I'm okay with using my best judgement because they are my responsibility in every other way as well (feeding, clothing, cleaning, etc). If they ever had to sue me to respect their wishes regarding photos of them online, I'd argue our relationship was already pretty trashy to begin with.

I think "news" sites like to dramatize and sensationalize statistical outliers in order to create fear in people which gets them more clicks as fear is a powerful (but in my opinion, destructive) motivator.