But evolution isn't "random" in the sense you mean: it's an example of cause and effect, not just a crazy sequence of unrelated events.

But even if it were, and if then nothing one thinks or says is trustworthy, the same condition would, unfortunately, apply to your own assertions.

Why should anyone believe what anyone else has to say if the thought and utterance could be perfectly random events unrelated to anything else, including each other?

In a truly random world, though, no meaningful communication would be possible. That's because languages themselves are ordered systems (though they do include certain unpredictable features, like irregular verbs, sound changes, etc.) No intelligible language could exist in a world of random developments, thoughts, words, and sounds - and no one but the speaker could understand it if it did!

But even understanding oneself requires orderliness....