No, that would just be removing all game play around criminality and piracy in highsec.
Freighters are everywhere in highsec! There is no reason to believe they need a buff of any kind. The highsec hauling meta already overwhelmingly relies on freighters, so it would be silly to make them even stronger.
At the very least, you need to pretend you care about game balance when you make a suggestion to make a powerful ship even better, and suggest some trade-off for the ability to fit a MJD. Otherwise, your suggestion just reeks of self-interest and will be ignored as another tilt-the-game-in-my-favour requests many of these feature proposals are.
Clearly that isn’t the situation with you or you would know the simple things you need to do to avoid making yourself a profitable target and how many ships the ganking groups pass over or can^t catch. Almost every freighter in highsec makes it safely to their destination, and if that tiny risk is too much for you for some reason, there are multiple other hauling choices that give other, more active, strategies to make yourself safe.