Further I argue that there is no hint of any intelligence out there reshaping its environment.

Uh, that's us. wave

In case you didn't realise, humanity is the proof of concept that superior intelligence is dangerous. Ask a chimpanzee.

I also do not see enough evidence for the premise that other superior forms of intelligence are very likely to exist.

Have you taken an IQ test? Anyone who scores significantly higher than you constitutes a superior form of intelligence.

There are many dumb risks that can easily accomplish the same, wipe us out. It doesn't need superhuman intelligence to do that.

Few such dumb risks are being pursued by humanity. Superhuman intelligence solves all dumb risks unless you postulate a dumb risk that is in principle unsolvable. Something like collapse of vacuum energy might do it.