That's what upsets me about these people, they are so strong about their beliefs and they're not always right. But they can be very convincing to the desperate people who will do anything to get better.
Colonics and enemas are very damaging, imo. It fits in with the medical thinking of the "quick fix". Real healing takes time. Forcing the body will only cause harm and even if something makes us "feel good" in the short run, we often suffer greatly from it in the long run.