What I'm going to say is controversial (of course), but it's mostly true: Pat King is a poor uneducated white person, and his misguided views are a product of his difficulties in life.
Obviously his own morality and ethics play into it, but the crux of the matter is that we understand why people have beliefs like this, and how to resolve the problem. See the efforts of Daryl Davis: https://en.wikipedia.org/wiki/Daryl_Davis
Daryl realized that most members of the KKK are down on their luck people who've been abused by the system for most of their lives. These people tend to look for scapegoats that they can rally their anger against. They have legitimate grievances that they channel into illegitimate beliefs, because of various failures of reasoning. These are not highly educated and powerful people with agendas.
The same kind of issues can be attributed to most anyone in a chronically bad situation.
It's about as much of a "gotcha" as attacking incels for being inept, frustrated, and lonely. Well, yeah.
That's why many people "overlook" things like this. Not because they agree with the sentiments that people like Pat King express, but because they understand three things:
1) The convoy protest isn't about Pat King's racist paranoia. It happens to be about a real problem that disenfranchises people. If anything, that could help people like Pat let go of their racist beliefs by realizing it's not just them with the problems.
2) Pat King is in no position to manifest his paranoid beliefs.
3) As condescending as it may be, poor and disenfranchised people tend to have problematic beliefs and behaviors; that doesn't mean they should be exiled. Otherwise, we'd wrongfully criminalize the homeless, drug addicted, and the mentally ill - which we often do, actually.
So, painting the convoy movement as fundamentally racist because you found out that there are vulnerable people involved is disingenuous and does nothing to solve the real issues that caused it. We all know what the goal of the convoy is: to drop the covid mandates.
That said, the convoy does lose it's legitimacy by not addressing the problem of people like Pat King, even as a propaganda smear. What I've just said is probably the gist of what they're thinking about it, but they haven't articulated this in public. However, I've heard them arguing about this on their Zello channel and from what I've heard they want to remove Pat King and are strongly against any racist sentiments.