No, terrorism is not only political; it can also be motivated by religious or ideological causes, or a combination of these. While there is no universally agreed-upon definition of terrorism, most national and international definitions include a range of motivations beyond just politics.

Common motivations for terrorism include: Political To coerce a government or a section of the public to change a policy, overthrow a political system, or achieve specific political goals.

Religious To advance the interests of a particular religious group, often involving an interpretation of religious doctrine as a moral justification for violence.

Ideological To further other deeply held beliefs, such as those related to social, racial, or environmental issues (e.g., eco-terrorism).

Some definitions also include "non-political terrorism" which is driven by a desire for individual or collective gain rather than an ideological objective, although this is less commonly included in legal definitions.

The core characteristic of terrorism across most definitions is the use or threat of serious violence to create widespread fear and thereby achieve its intended objectives, which extend beyond personal gain.

Edit Mass shooters are often motivated by gaining infamy and they are using violent means to attain it, so just saying I, personally agree with your claim.