When's the last time Finland or Switzerland attacked or invaded another country? People are willing to engage in compulsory military service if they feel that it's truly meant to help the country defend itself from actual attack, not potentially being shipped off somewhere to serve some political or economic goal.

> When's the last time Finland or Switzerland attacked or invaded another country?

Not recently to my knowledge, but Finland has extensive experience being invaded given they are neighbors with Russia (and Sweden in the past). When your next door neighbor keeps seeing your country as "their property," you need means to push them back.