There's no conceivable way that, within the next few years, our engineering capabilities or understanding of things will be able to do a manned deep space mission to Mars, safe or not. We could try to just put a bunch of guys in a box and send it that way. I doubt we could design, build, orbit, and then get the box on it's way in the "next few years". Let's be serious. Nobody with space capability is looking at a Mars mission any time soon (next few decades*). The level of complexity needed will take time, research, and money. We didn't go to the moon till Apollo 11. Once you start seeing your Mars missions planned, let alone counting up, then we can start being serious about going to Mars. Seriously, we need to test deep space habitats. Long term independent space habitats. Long range movement of large structural objects in space. I bet we will have a deep space station and have sent something similar in a long trip around the moon long before we attempt Mars.
*Elon Musk said it's possible in the next 10-12 years. I think he is just being overly optimistic, and that is overly optimistic, to get in the papers.