No one is considering why these children are behaving like this. I think it's because they are having trouble expressing that they feel bad for some reason. Often I think it is due to pain - teething being a big one. Mine is getting his second molars at the moment and as far as I can tell, it bloody hurts.
Yes he has moments when he is very loud and shouts and cries, most children of this age do and how you respond matters. He can be irrational; you have to try and ride it and not get into a fight. That's the point of being their parent - you don't fight them when clearly they are smaller than you and can't control themselves.
He doesn't know it's pain, or that it will go away. He's just unhappy. S he screams.
Leaving him to it or locking him in a room is not the option I'd favour, distraction works very often, also picking him up and taking him into another room or showing him something exciting - or if all else fails, just sitting with him or near him till he decides to play peekaboo instead of crying, or wants to do something else.
Children can get themselves out of tantrums if you're just prepared to wait with them. Turning it into combat - though it is easy to perceive it as their 'attacking' you with their screams and kicks - isn't needed.
I didn't understand this with child 1 but by child 3 it's so much easier because I know what doesn't work, what makes things worse, and above all, that responding considerately to their needs doesn't make me weak and doesn't mean they will take over the world and destroy the house. Or become spoiled.
I don't blame people for taking other sorts of action as you do feel horribly threatened by a screaming child, that's normal. It's just having the confidence to be the bigger person and not let it rile you. Once you have it, it's easy. But you have to believe in it.
Good luck.