The last time I got one and had the bad reaction I dived deep into what they do and are meant to do. Part of the problem (for a moment setting aside the right or wrong of it) is that you are almost never told before hand that the vaccine is going to damage your immune system to trigger a response to the injected material.

The correct way to do a vaccine is to do your "cold routine" a few days before a vaccination. Lots of water, good rest, make sure you're eating well and taking your vitamins, etc. Get your immune system improving and clear out anything that's lurking. People don't know to do this and then when the vaccine hits their immune system is damaged while keeping something at bay so then they get a "touch of the flu". Ideally you should never get a "touch" if you're doing it right, but that won't get you into the doctor's office for the nice visitation fee now will it?

Now the wrong of it is in the chemicals used to damage the immune system to trigger that response. Otherwise the theory is sound. Those chemicals degrade the immune system and are likely to stick around, so you never get back to 100%. It's ok if you get one or two over the course of your life, but when you get 30, 50, 100 your immune system suffers permanent damage.

That's my take on it at least. Been a while since I looked into it so the science may have changed.