Yes, you're right US can be involved in it. But the most probable are extremist forces who at any cost want Bangladesh to fall into Islamic Narrative of religious radicalism. 

US just wants an Island but that island is much disputed. More than 2 countries claim that. Even if Bangladesh allows US, Vietnam would have objections to it. India had already made it clear that it won't allow any Western powers inside Bay of Bengal.

Coinsreporter

conspiracy

Here's Why Bangladesh Lied About India Being Responsible For The Latest Floods

I thought of you when reading this article a few hours ago. In the US Bangladesh isn't in the news often. I was guilty of swallowing the MSM narrative. This article certainly aligns with the events you depicted in your posts. US complicity isn't shocking. 