I understand. You lived too long in Russia. Now it's not possible for you to trust government. All government is suspect in your mind. I understand that.
Do you honestly think that if there was clear and provable evidence that Trump colluded with the Russians, that someone would not show it to the world at this point? It would be the Holy Grail.
It seems unlikely that Trump colluded with the Russians to hack the election. But it's certainly not out of the question. We won't know until many months hence, unless a "John Dean" comes forward. The investigation of Russian hacking is critically important regardless of whether Trump personally, or anyone else in his campaign, colluded with the Russians.
What Trump is worried about is that the investigation will uncover money laundering or other illegal financial activities he was involved in. The circumstantial evidence for this is overwhelming!!!