Safety of a mass driver tug, or lack thereof

>>>>why not only use a mass driver as a form of proplusion
when you know that the pellets can be set into an
orbit that will "hit" the sun.use the mass driver in
combination with something like that magnetic baloon
solar wind sail space.com had an article about a few
weeks ago.
better still use the pellet as just the first stage
of mometum transfer, move the pellets thru after they
have been shoot out of the massdriver to an area where

intense light from a laser or even concetrated
sunlight
would vaporize it into charged plasma which the ship
could push off again using an expanding magnetic
field.
it seems with a little modification the pellet no
langer becomes a problem.
regards>>>>

The benefit of using a mass driver is that it provides a low tech, low
cost mechanism of propulsion. R&D costs are virtually zero and you can use
anything as fuel. Ion and plasma based propulsion systems are significantly
more complex than mass drivers and in order to form a practical propellant,
a substance must have a low first energy of ionisation, hence Xenon,
mercury and Caesium, etc.