Whether or not investing in Tron coins is safe is relative to all investors because Tron is also designed to be decentralized, but if we lose access to our private keys, Tron is not safe.
The negligence factor by ourselves is also a factor if investing in Tron coins can be safe or not because everything in the cryptocurrency environment is do with your own risk (DWYOR).
For me personally, investing in Tron coins is safe because I carefully guard the private keys I have to store Tron coins.
But it will be different if the private key I have is lost or stolen by hackers, then my Tron assets are not safe.