Dried beans have many good points. They're cheaper and easier to transport than tinned ones, and they take up less space in the freezer than tins do in the cupboard. And you know how long they were cooked for - I often find myself boiling tinned ones, particularly red, before use, having been reduced to a puking mess once before. Here, however, is what can happen if you don't cook them properly. If you do cook them properly - putting them on to soak one evening and boiling the next, changing the water at each step - you're fine.
A vegan diet is a normal diet - complete with normal risks!