Why does having some sort of a fetish makes a person so weak?

I would not agree on this. A fetish is considered a weakness by some - I would rather think it's a very special talent.

Depends on your popularity here

It depends on the person. If someone's a slave to their fetish it can be used to manipulate them in which case yes, that'd be weakness. Most just know what they like but it's not all they are.

A fetish is fine, it's only a problem when it becomes all-consuming and the only thing someone ever talks or thinks about. At that point it's developed into an obsession, and those are never healthy.

This is a pretty good definition of what happens.

A paraphilic fetish disorders is recurrent, intense, sexually arousing fantasies, urges, or behaviors that involve inanimate objects, or suffering or humiliation of oneself. The pattern of sexual arousal often acquires symbolic and conditioning elements (eg, a fetish symbolizes the object of arousal and may have been accidentally accidentally associated with sexual curiosity, desire, and excitement). It results in an altered arousal pattern.

Fetishism itself is a form of paraphilia, but most people who have fetishism do not meet the clinical criteria for a paraphilic disorder, to be classified as a paraphilic disorder it requires that the person's behavior, fantasies, or intense urges result in clinically significant distress or functional impairment. The condition must also have been present for ≥ 6 months.

There are many fetishes; common fetishes include aprons, shoes, leather or latex items, and women’s underclothing. It can range from a fetish that replaces typical sexual activity, one that is integrated into sexual activity with a willing partner, one that is required to achieve sexual orgasm or anything in between. Minor fetishistic behavior as an adjunct to consensual sexual behavior is not considered a disorder because distress, disability, and significant dysfunction are absent. More intense, obligatory, and highly compulsive fetishistic arousal patterns and behaviors could cause problems or become all-consuming.

hmm.. well make it easier to entice you sure. but i dont think it fits any dictionary definition of weak. weak-willed id say yes but as a generalized weak id say no

If you know what it is it can give you power over them sometimes.

i think that depends on how much fetish affects them. like just cuase they have a foot fetish doesnt neseceraly mean they be weak cuase they see feet.

Depends on the fetish

Lot's of people who have fetishes have a great deal of willpower.

On the other side of the proverbial coin, there are a lot of weak-willed people without fetishes, too.

Ah... I don't. It depends on the fetish. If the fetish is about child molesting or something like that, then that's something to be concerned about.

Even I have a fetish of my own.

I wouldn't agree.

I'll agree with @GreenGoddess.

Strongly agree

In correct

It's more than weak, it's desire to explore

Fetish is desire

Everyone has a fetish, most just don't admit to it, it's the emotionally strong ones that can talk about their fetish, the weak hide it because they've been shamed by other weak people.

I don't find myself weak