Gallipoli as a failure of execution

Did Churchill's role in Gallipoli show that the operation was a bad strategic idea from the start?

Not necessarily. The strategic concept was defensible, but its fragmented and half-hearted execution was disastrous.

Gallipoli's underlying strategic plan is presented as defensible. The execution turned it into a disaster. Senior figures who understood the intended gamble left implementation to people who did not share the plan's assumptions, producing disconnected half-measures. A high-risk amphibious strategy had to be carried through coherently or abandoned, because partial commitment preserved the danger while forfeiting the intended payoff.