Parenting

I'll note however, there are 2 sorts of tantrum. Emotional, and tactical. Your comment only applies to the latter. Emotional tantrums are a fact of life for parents. They get better, but only with life experience.

Also, the best counter to tactical tantrums is to provide an alternative outlet for their desires. My daughter learnt that, while tantrums got little headway, polite, calm, negotiations are highly effective. It makes shopping trips a lot easier.

As for tech tantrums, they can be a mix of types. Cutting them off can generate a lot of withdrawal. That has big emotions attached to it, that need to be processed. Emotional tantrums are common under those sorts of stress.