Why does someone that buys into a stock after doing research...

Why does someone that buys into a stock after doing research automatically make every share holder that there is insider trading, makes me laugh everytime the SP moves everyone thinks that they are left in the dark about information. Maybe it was someone who had a high average price (long term SH) and wanted to buy at a cheaper price to reduce his average? Im saying that HXG is due for an announcement whether its good or bad because they havent in a while, and the buys over the last few days dont always mean insider trading