You're missing the point. State funerals are public events by design. Each former president is entitled to a state funeral, contingent on the family's wishes. Were the state not to honor the family's wishes for a state funeral because of fear, yes, it would be cowardly.
No, not actually. Notwithstanding everything else you said, it's not cowardly to be a little more discrete with minute to minute plans. It's not fear, it's common sense.
The funeral will go on and should, and I may be right or wrong about my concerns, but this BS about cowardice is so over the top it's ridiculous.