diff --git a/src/applications/policy/filter/PhabricatorPolicyFilter.php b/src/applications/policy/filter/PhabricatorPolicyFilter.php
--- a/src/applications/policy/filter/PhabricatorPolicyFilter.php
+++ b/src/applications/policy/filter/PhabricatorPolicyFilter.php
@@ -90,6 +90,29 @@
     PhabricatorUser $user,
     PhabricatorPolicyInterface $object) {
 
+    $capabilities = self::getRequiredInteractCapabilities($object);
+
+    foreach ($capabilities as $capability) {
+      if (!self::hasCapability($user, $object, $capability)) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  public static function requireCanInteract(
+    PhabricatorUser $user,
+    PhabricatorPolicyInterface $object) {
+
+    $capabilities = self::getRequiredInteractCapabilities($object);
+    foreach ($capabilities as $capability) {
+      self::requireCapability($user, $object, $capability);
+    }
+  }
+
+  private static function getRequiredInteractCapabilities(
+    PhabricatorPolicyInterface $object) {
     $capabilities = $object->getCapabilities();
     $capabilities = array_fuse($capabilities);
 
@@ -107,13 +130,7 @@
       $require[] = $can_interact;
     }
 
-    foreach ($require as $capability) {
-      if (!self::hasCapability($user, $object, $capability)) {
-        return false;
-      }
-    }
-
-    return true;
+    return $require;
   }
 
   public function setViewer(PhabricatorUser $user) {
diff --git a/src/applications/transactions/controller/PhabricatorApplicationTransactionCommentEditController.php b/src/applications/transactions/controller/PhabricatorApplicationTransactionCommentEditController.php
--- a/src/applications/transactions/controller/PhabricatorApplicationTransactionCommentEditController.php
+++ b/src/applications/transactions/controller/PhabricatorApplicationTransactionCommentEditController.php
@@ -36,10 +36,9 @@
     // auditing, and editing comments serves neither goal.
 
     $object = $xaction->getObject();
-    $can_interact = PhabricatorPolicyFilter::hasCapability(
+    $can_interact = PhabricatorPolicyFilter::canInteract(
       $viewer,
-      $object,
-      PhabricatorPolicyCapability::CAN_INTERACT);
+      $object);
     if (!$can_interact) {
       return $this->newDialog()
         ->setTitle(pht('Conversation Locked'))
diff --git a/src/applications/transactions/editor/PhabricatorApplicationTransactionCommentEditor.php b/src/applications/transactions/editor/PhabricatorApplicationTransactionCommentEditor.php
--- a/src/applications/transactions/editor/PhabricatorApplicationTransactionCommentEditor.php
+++ b/src/applications/transactions/editor/PhabricatorApplicationTransactionCommentEditor.php
@@ -189,10 +189,10 @@
         $actor,
         $xaction,
         PhabricatorPolicyCapability::CAN_EDIT);
-      PhabricatorPolicyFilter::requireCapability(
+
+      PhabricatorPolicyFilter::requireCanInteract(
         $actor,
-        $xaction->getObject(),
-        PhabricatorPolicyCapability::CAN_INTERACT);
+        $xaction->getObject());
     }
   }
 
diff --git a/src/applications/transactions/view/PhabricatorApplicationTransactionView.php b/src/applications/transactions/view/PhabricatorApplicationTransactionView.php
--- a/src/applications/transactions/view/PhabricatorApplicationTransactionView.php
+++ b/src/applications/transactions/view/PhabricatorApplicationTransactionView.php
@@ -513,10 +513,9 @@
         }
       }
 
-      $can_interact = PhabricatorPolicyFilter::hasCapability(
+      $can_interact = PhabricatorPolicyFilter::canInteract(
         $viewer,
-        $xaction->getObject(),
-        PhabricatorPolicyCapability::CAN_INTERACT);
+        $xaction->getObject());
       $event->setCanInteract($can_interact);
     }