If we look to history, we find that none of those things were all that unusual at the time. By way of example, around 112 AD Pliny, Roman governor of Bythnia, wrote a letter to Emperor Trajan regarding the trials of accused Christians. He said in part:
Those who denied that they were or had been Christians, when they invoked the gods in words dictated by me, offered prayer with incense and wine to your image...
Worshipping the image of the Emperor was common at the time, and something Christians were prohibited from doing. The "dragon" of the Revelation is the same dragon that took one third of the angels from heaven into rebellion, see Rev 12:9. The dragon appears throughout the Revelation as the power causing people to do bad things in general, including the slaughter of the innocents leading to the flight to Egypt, see Rev 12:4-6. The dragon is Satan.
Long story short, the beast of the Revelation is the Roman Emperor, and in the end, was Vespasian. Vespasian led the initial invasion of Israel that led to the destruction of the temple. While he was in Israel he was appointed Emperor and returned to Rome, leaving his son Titus to continue the invasion and the ultimate sacking of Jerusalem. Titus caused men to fall down and worship the image of his father, killing thousands upon thousands in different ways, including with the beasts of the earth, see Rev 6:8.
This is a very long study, and in it you'll find the sea turning to blood, men seeking death and not finding it, the pain of a scorpion sting, and on and on.