Because a thesis is a proposition one puts forth in order to support and defend the idea.
Does the following sentence make sense?
"The Thesis is a statement of theory."
Options:
- yes
- no
yes

Like any sport dodgeball does require some physical skill and stamina.
Is the following sentence factually correct?
"Dodgeball, a team sport, requires some physical skill."
Options:
- yes
- no
yes

There is no record of Delius inventing the Tuba.
Is the following a factual statement?
"Frederick Delius invented the Tuba over a period of time."
Options:
- yes
- no
no

A major component of a clinical psychologists job is to perform psychotherapy.

Yes / no, is the following a verifiable fact?
"Clinical psychologists perform Psychotherapy on patients regularly."
yes