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PA has a closed primary. In closed primaries, people tend to switch their registration in order to effect the primary they see as most impactful. It is not unlikely that the shooter registered as republican to vote against Trump in the primary.
Edit: Downvotes without explanation are fun…
The most prominent LGBTQ+ republican organization is call the Log Cabin Republicans and annually present the “Spirit of Lincoln Award”. They were founded in the '70s so the idea that Lincoln was LGBTQ+ himself has been around for quite some time.
As a side note, recent recipients of the “Spirit of Lincoln Award” include Melania Trump and Kellyanne Conway who are obviously prominent LGBTQ+ advocates…
Lots of very full leopards around the Log Cabin Republicans I think…