If people cannot do the interesting things they want to do, they will lose interest. They will probably not become interested in the things we'd prefer they do, instead.
If a boy's father desperately wants him to like camping out in the woods, but the boy only wants to read comic books, the father can't make the boy like camping by banning comic books from the house. The boy will still not be interested in camping -- and worse, he might not be interested in doing anything at all with his father.
Obviously, the father should invite the boy to bring his comics out on the trail with them. The boy gets to do the thing he really likes, but he also gets a chance to be exposed to the interesting aspects of a new activity.
If we tax holding office, then we discourage people from holding office. The tax isn't much, of course (right now), and the people who will be discouraged are mostly the young or poorer people or people who speak English as a second language. But why are we taxing people for doing the fun things they want to do at all, if we can help it? Isn't that kind of the opposite of what we're here to do?
We shouldn't be adding a tax on holding a seat in the Senats. We should be eliminating the fee for holding a seat in the Cosa.