If I recall correctly (and I have a terrible memory), gparted was originally posted without icon or menu item - after some complaints, I decided to add just the menu item as a compromise.
The concern is that a user trashes his/her hard drive by mistake..
I also have a poor memory and do not recall the complaints.
By its nature TC is unlikely to appeal to a user with a zero level of understanding. The underlying philosophy of TC as a toolkit to "build it your way" requires at least some knowledge and skill.
The degree of protection afforded by omitting the icon while also including a menu item is marginal.
In view of the above, and also the comments by
bmarkus, I tend towards the inclusion of the icon. Of course, your decision as package maintainer will be respected.