‘Too bad, too bad, the great city, in which all those who had ships at sea became rich from her wealth, because in one hour she has been devastated!’

[Bible Speaks]

I can see the "burning" can you? 

19 "They threw dust on their heads and cried out, weeping and mourning, and said: ‘Too bad, too bad, the great city, in which all those who had ships at sea became rich from her wealth, because in one hour she has been devastated!’ (Revelation 18:19) NWT 

Why do “the kings of the earth” grieve over the very entity they themselves have devastated? 

The reason for their grief is strictly selfish. After the destruction of Babylon the Great, the kings of the earth evidently come to realize how useful she was to them. She provided a religious front for their oppressive deeds. Babylon the Great also helped them in recruiting youths for the battlefields. Moreover, she played an important part in keeping people in subjection.

In additional significant factor is that when Babylon the Great goes down under the devastating attack of the ten horns of the symbolic wild beast, her fall is mourned by her companions in fornication, the kings of the earth, and also by the merchants and shippers who dealt with her in supplying luxurious commodities and gorgeous fineries. 

While these political and commercial representatives survive her desolation, notably no religious representatives are depicted as still on the scene to share in mourning her downfall. (Re 17:16, 17; 18:9-19) 

The kings of the earth are shown as having judgment executed upon them sometime after mystic Babylon’s annihilation, and their destruction comes, not from the “ten horns,” but from the sword of the King of kings, the Word of God.—Re 19:1, 2, 11-18.

A further distinguishing characteristic of Babylon the Great is her drunkenness, she being pictured as “drunk with the blood of the holy ones and with the blood of the witnesses of Jesus.” (Re 17:4, 6; 18:24; 19:1, 2) 

She thus is the spiritual counterpart of the ancient city of Babylon, expressing the same enmity toward the true people of God. Significantly, it was to the charge of religious leaders that Jesus laid the responsibility for “all the righteous blood spilled on earth, from the blood of righteous Abel to the blood of Zechariah.” 

While those words were addressed to religious leaders from among Jesus’ own race, the Jewish nation, and while persecution against Jesus’ followers was particularly intense from that sector for a time, history shows that thereafter the opposition to genuine Christianity came from other sources (the Jews themselves suffering considerable persecution).—Mt 23:29-35.

All the above factors are significant, and they must all be considered in arriving at a true picture of symbolic Babylon the Great and what it represents. 

Revelation 18:9, 10—Why do “the kings of the earth” grieve over the very entity they themselves have devastated? The reason for their grief is strictly selfish. After the destruction of Babylon the Great, the kings of the earth evidently come to realize how useful she was to them. She provided a religious front for their oppressive deeds. Babylon the Great also helped them in recruiting youths for the battlefields. Moreover, she played an important part in keeping people in subjection.

https://wol.jw.org/en/wol/d/r1/lp-e/2009124?q=rev+18&p=par 

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