I can be respectful of something and not oppose it without being in support of it. Being asked to declare the latter? Another twist of a knife.
The form doesn't require organizations to "support" any rights, only respect them (with respect pretty clearly defined by now, and not to be confused with "admire" or "hold in high esteem").
Canada's abortion law was struck down on the point of security of the person, and rightly so.
The government doesn't want to give our money to organizations that are actively seeking to undo that. Again, organizations know whether this is or is not part of what they do.