why did Tippit have to die?

[Brian Castle]

J.D. Tippit appears to have been waiting for brown-shirted Oswald at the Gloco station, where Oswald probably would have gotten off to walk to the rooming house. Tippit's behavior when Oswald failed to get off McWatters' bus near the Gloco station clearly suggests this scenario.

Hi Jim - are you hinting that it wasn't the DPD that tooted their horn in front of the rooming house?

If Tippit missed Oswald at the Gloco, wouldn't the logical thing to do have been, to go the rooming house?

If the instructions were to maintain radio silence, then it seems Tippit might have panicked, and gone to the Top Ten store against orders. Even though Tippit didn't say anything into the phone, the call might have gone through anyway, and someone might have said something "to" him. A loose cannon during a critical phase of the operation would have been dangerous.