Yeah, they were. What makes you think they weren't?
en.wikipedia.org
Membership of a local shooting club. Wanted to be in the shooting club at school but was rejected. Walked around in hunting gear. Sure... doesn't say "Republican" or "right wing", but more likely to be so.
"Authorities have said that Crooks's political views are unknown, and they have not determined whether his assassination attempt was politically motivated.
[6] Public records do not indicate his views."
"On January 20, 2021 when he was 17, he donated $15 to the Progressive Turnout Project, a liberal
voter turnout group, through the
Democratic Party donation platform
ActBlue.
[13][48][18][49] His donation was made on the same day that President Biden was
sworn into office.
[12] According to the Progressive Turnout Project, he made the donation in response to an email about "tuning into" the inauguration. He unsubscribed from the group's mailing list in 2022.
[50][47]
Crooks had been
registered to vote since September 2021, when he turned 18.
[2] He registered as a
Republican[2][3][48][51] and he voted only once, in the
2022 midterm elections."
" public statement from FBI deputy director
Paul Abbate described Crooks's activity on
social networking services as including comments that "appear to reflect
antisemitic and
anti-immigration themes" and "espouse
political violence""
He was 20 years old. Probably didn't know what he was. He wasn't liberal, probably wasn't conservative either.
He was bullied, he was a little unstable. That instability probably led him to going onto social media and saying things that were a little crazy, boys do that. It doesn't mean they are anything. It could have developed into something, it could have fizzled out.
But he wasn't a "liberal".
en.wikipedia.org
This guy was just a wack job and had been for a long time. Certainly his craziness led him to more far right extremist views, but also potentially far left.
"According to posts on his
Twitter account in 2020, Routh has expressed shifting political views over the years."
This being he supported Trump, then hated Trump for not doing the craziness that Routh wanted him to do, or though Trump would do.
"Routh also supported
Bernie Sanders in 2020, criticizing
Joe Biden as "
Sleepy Joe"."
Which seems to show that he'll go to the more extreme of politics. That doesn't make him a liberal. Liberals are close to the center of politics but on the left. Like a conservative will be to the center of politics but on the right. This guy was far-whatever took his fancy.