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JimboSaturn The inscriptions are memes that are political in this context. They are all associated with 'Groyper War'. The whole reason he was there to shoot Kirk was political. Of course it's speculation at this point but I highly doubt Robinson is radicalized to the left, considering he'd dressed as a green-faced Trump and then later as a Groyper for Halloween. As for the Italian anti-fascist song; Groypers and other alt-right groups use it to make fun of leftists. He was calling Kirk a leftist as an insult.
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Jackaloftheazuresand Yes, Pepe the Frog made his debut in 2005. On January 10th, 2013, the earliest reference to the Slav Squat on 4chan surfaced. In 2017, Robinson dressed as Trump with a green face, a possible reference to Pepe the Frog. The use of memes in political violence started in earnest in 2019. I haven't been able to find out the exact year he dressed as the Pepe meme but it definitely wasn't before 2013. However, it’s somewhat likely, I suppose, that he was just a teenage boy dressing up as memes he saw online.