Most of the arguments in Match the Reasoning are valid. The remaining ones are pretty darn reasonable.
There's only been one example ever of a Match the Reasoning question stem that went with a clearly-flawed argument (and the correct answer leaned on us understanding the flaw).
So my policy with Match the Reasoning is
1. assume it's probably a decent, if not valid, argument.
2. focus on how it works, not how it's flawed
(3. retain a 1% chance in the back of your mind that they might actually give us a flawed argument and test the flaw)
p.s. here's that one exceptional example
https://www.manhattanprep.com/lsat/foru ... -t692.html