Liberals mostly value the "individual liberties" that most western liberal democracies provide. It is as simple as that, anything that can put the liberties of an individual at risk, even for a greater "good", is a major red flag.

Of course that nothing in this world is binary or black&white, so for society to work certain compromises/tradeoffs are required, so each liberal will have his own threshold on any given topic.

Of course things are viewed differently depending on the country, in some countries liberals are placed on the right on other countries they are viewed as left, but it mostly depends on the existing political parties and scene on that specific country.

But evaluating a messy and complex "world" using a single dimension model (left vs right) is dumb anyway.