It's like this. Insiders sell a small percentage of their shares and use that money to invest in the company. Said investment brings revenue, thus upping the share price to a greater percentage of those shares that were sold.
An insider has 1,000,000 shares, and sells 100,000 to create a new revenue stream.
9,000,000 shares remain but new revenue stream increases share price 15%.
10% of shares sold, remaining shares worth 15% more now.
It's called investing in the future. I am perfectly OK with insiders selling shares to enable TRTC's growth.