You should probably use strict first off - would catch one of the errors in your code.

First - you're using the wrong equality tester - if you want to test if a variable is equal to the string "true" use the eq operator.

This follow line has to be changed for 2 reasons - you are actually doing an assignment - the single equals = means $WeWantToMakeAChange gets the value of 'true'. Second you should use eq to evalue if a string is equal.

if( $WeWantToMakeAChange eq "true" ) {
}
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But why not use 1 for true and 0 for false instead of these strings?