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In a matter of days, authorities have revealed a trove of information about Cole Allen after he allegedly tried to assassinate President Donald Trump, while the public has learned little about Thomas Crooks nearly two years after his assassination attempt.

The contrast raises new questions about transparency and what remains unknown about Crooks' shooting of Trump, and experts say the explanation may be simpler than it seems.

In the latest case, investigators quickly developed a clearer picture of the suspect’s apparent grievances, communications and alleged planning.…