Why destroy Laketown's bridge?

[Rikae]

Originally Posted by Sauron the White

You claim that the picture contradicts the text. Could you take the above description by JRRT and explain where it contradicts what he shows in the picture because I see no such problem or difficulty.

That, as you probably well know, is not the part of the text it appears to contradict (that part being the destruction of the bridge in little time).

I have no "theory" about what that passage means.

So you argue against our explanation of the passage by explaining the first part and ignoring the second, about which you have "no 'theory'". Thank you for making that clear.
(Or are you, with the scare quotes, suggesting that you have no 'theory', but rather access to some sort of "fact" about why Tolkien brought up the issue of plunging into the water?)